Peter Rogers

What Peter says, topic by topic

Vitamin B12

In a 2021 video Rogers said the liver holds several years of B12, but that anyone fully vegan, himself included, will probably run low in time¹. He recommended methylcobalamin, calling it an active form of the vitamin², taken under the tongue so that it skips the gut’s complex absorption route³. He suggested keeping blood levels roughly in the 500 to 1,500 range⁴.

His view moved in 2026. In March, after reading a book by Anthea Hayes that calls the vitamin a myth, he said he had stopped taking B12 and doubted it was even real⁵, while adding that he could recheck his levels and might change course⁶. In April he said he had resumed it after about five weeks, at about a third of his former dose⁷. In May he said he could not advise others to go without it, since the biochemistry textbooks and neurologists hold that it is real⁸.

By mid 2026 he described taking a very small amount, about one tablet every two months, and called the question unresolved⁹. In July he named B12 as the only supplement he takes¹⁰.

What all the experts say about vitamin B12

Vitamin D

Rogers prefers sunlight to pills. In a 2022 video on cancer prevention he said vitamin D from the sun is much better than from a pill, and noted that McDougall gave pills only to people who cannot go outside¹¹. In a 2024 lecture he said he sits in the sun for half an hour with a book, and that the activated form of the vitamin matters more than the form measured in blood tests¹².

He links this to dairy. In a 2021 video on milk he said the large calcium load in dairy makes vitamin D less likely to be converted to its active form¹³.

What all the experts say about vitamin D

Omega-3 fats

In a 2024 video asking whether omega-3s are a joke, Rogers said at the outset that he does not take omega-3s and considers them a bad idea¹⁴. He said fish oil lowers blood triglycerides but raises LDL and total cholesterol¹⁵, and that the many double bonds in EPA and DHA make them especially prone to going rancid, a process called lipid peroxidation¹⁶.

He made the same case in 2022, adding that fish oil has to be kept in dark bottles in the fridge because it oxidizes so easily¹⁷. Reviewing McDougall’s book The Starch Solution in 2024, he said ordinary plant foods already hold plenty of omega-3 and omega-6, so high-fat sources are not needed¹⁸.

What all the experts say about omega-3 fats

Oil

In a 2022 video on olive oil Rogers called it pure liquid fat, at 9 calories per gram the most calorie-dense food there is¹⁹. He cited a 2000 study by Robert Vogel in which olive oil cut flow-mediated dilation of the arteries by 31% at three hours²⁰, and other studies in which olive, soybean and palm oils all raised blood triglycerides and impaired the artery lining²¹. He rejected claims that olive oil protects the heart or brain²².

In a 2026 video he said that telling people simply to cut down on oil is not good advice, and endorsed Esselstyn’s rule of no oil at all, which he said McDougall shared²³. In 2025 he called a whole-food, low-fat vegan diet without oils the best diet for the coronary arteries, able to prevent and even reverse atherosclerosis²⁴.

What all the experts say about oil

Protein

Rogers holds that protein deficiency is not a real risk on any natural diet. In a 2022 video he cited a 1982 Lancet paper by M. H. Golden in which 66 malnourished patients recovered on a diet with only 2.5% of calories from protein²⁵. He said people should keep protein, and above all animal protein, as low as they can²⁶.

In 2024 he told viewers not to worry about protein deficiency at all, except perhaps when healing a large wound after days without food²⁷. In 2025 he called the official allowance of 0.8 grams per kilogram a day far too high²⁸.

What all the experts say about protein

Calcium, dairy and bones

In a 2021 video Rogers called milk “liquid meat” for its saturated fat, and raised concerns about estrogen in milk from pregnant cows²⁹. He said osteoporosis is not usually caused by a lack of calcium¹³.

In a 2025 video on vegan myths he argued that milk raises the risk of osteoporosis: animal protein is acid forming, and the kidneys lose calcium as they excrete the acid³⁰. In a 2022 video on the spine he pointed to sunshine, for vitamin D, and to exercise as ways to keep bone mass³¹.

What all the experts say about calcium, dairy and bones

Iodine

Rogers treats iodine as a minor issue for vegans. In a 2022 video on thyroid disease he said goiter from iodine-poor soils matters less now that food comes from many places³², and warned that seaweeds sold as iodine sources may carry contaminants³³.

In 2024 he said he avoids salt and has never had a problem with iodine, and listed plant sources such as green leafy vegetables, carrots, oats and green peas³⁴. The same year he called low iodine fairly uncommon, mentioned iodized salt free of aluminum as an option, and said he is wary of algae because of a possible toxin³⁵.

What all the experts say about iodine

Calorie density

In 2026 Rogers described vegetables, at about 1.1 calories per gram, as stretching the stomach so hunger is satisfied sooner, and said eating them first helps weight loss³⁶. He also said vegetables alone are not dense enough in calories to satisfy hunger, which is why he puts starches, and fruit, at the centre³⁷.

What all the experts say about calorie density

Nuts, seeds and avocado

Rogers does not eat nuts. In a 2025 video he said walnuts get 89% of their calories from fat, almonds 78% and cashews 74%³⁸. He also questioned some seeds, citing a blogger’s tests that found high lead in sunflower seeds³⁹.

In another 2025 video he said “Nuts are totally overrated” and that avocados, being so high in fat, should never be eaten⁴⁰.

What all the experts say about nuts, seeds and avocado

Soy

Rogers advises against soy, unlike most experts in this guide. In 2022 he said he saw no great benefit in soy and possible significant problems, among them its estrogen-like compounds and solvent processing with hexane⁴¹.

In a 2023 lecture he called soy “uniquely estrogenic” and added concerns about glyphosate on non-organic, genetically modified soy⁴²⁴³. In 2024 he said McDougall disapproved of soy more than people realize, citing a young patient McDougall told to avoid it⁴⁴.

What all the experts say about soy

Salt

In a 2022 lecture built on the work of Richard Moore and Walter Kempner, Rogers said the average American eats around 7,000 mg of sodium a day, mostly from processed food, against roughly 200 to 500 mg on a purely plant diet⁴⁵. He said blood pressure changes little when sodium falls from 10,000 to 3,000 mg, but drops sharply below about 500 mg, a point Kempner stressed⁴⁶. He also stressed eating more potassium relative to sodium⁴⁷.

What all the experts say about salt

Sugar

Rogers sees sugar as a side issue. In a 2026 video he said sugar sits at the edge of the Western diet problem rather than at its center, though he called high-fructose corn syrup “pretty bad stuff”⁴⁸. In the same video he agreed with McDougall that fat, too much protein and too little fiber matter far more than sugar does⁴⁹.

He still avoids added sugar himself. In a 2025 video he described an accidental test: after about two months of drinking a large bottle of cherry juice every day, some 240 extra calories, he gained about five pounds, a dental cavity flared up again and he had bouts of rebound low blood sugar, and he called the experiment another failure for the sugar diet⁵⁰.

What all the experts say about sugar

Starches

Rogers calls McDougall’s teaching that humans should eat starch the most important thing he learned in over 30 years of medicine⁵¹. In the same 2026 video he said McDougall’s advice of 90% starch was aimed at older, sick patients, and that he himself eats about 60% of calories from starch, 35% from fruit and 5% from vegetables⁵².

What all the experts say about starches

Fasting

Rogers has long eaten one meal a day on workdays. In a 2021 video he described this time-restricted eating as having only dinner, mainly to save time⁵³. In a 2022 follow-up he said he lost 34 pounds in about six months on it⁵⁴, and that he now also eats breakfast when he has time, for energy before exercise⁵⁵.

What all the experts say about fasting

Supplements

Rogers takes no supplement other than B12. He said so in a 2022 video on what he eats⁵⁶, and again in 2025⁵⁷. Closing his obesity book in a 2025 lecture, he said B12 as methylcobalamin is the only supplement such a diet needs⁵⁸.

In a 2026 video on creatine he advised ordinary people against it, citing possible complications and his worry that supplements are often contaminated, while admitting that his search of the literature found fewer proven problems than he had expected⁵⁹. He allowed that a professional athlete with a lot riding on performance might reasonably take it⁶⁰.

What all the experts say about supplements

Iron

Rogers argues that iron overload, not shortage, is the common problem. In a 2022 lecture he said people on a Western diet take in far too much iron and build it up over time as a slow poison⁶¹. In 2026 he said anemia is fairly uncommon, while most men past 25 and most women after menopause are iron overloaded⁶².

What all the experts say about iron

Fish and eggs

In a 2022 video Rogers said eating fish is “definitely a bad idea”, pointing to its saturated fat and the fats oxidized by cooking⁶³. He added that fish often carries pollutants such as mercury and PCBs⁶⁴.

What all the experts say about fish and eggs

Fiber

In a 2026 video Rogers said fiber is far more important than most people think⁶⁵. Gut bacteria turn it into butyrate, which he said feeds the cells lining the gut, keeps the seals between them tight against a leaky gut and damps down inflammation⁶⁶. He stressed that only plant foods contain fiber, and that oil and sugar have none⁶⁷.

In the same video he linked low-fiber eating with constipation, obesity, high blood pressure, diabetes, heart disease, several cancers and dementia⁶⁸. He builds on the surgeon Denis Burkitt, and in another 2026 video explained Burkitt’s idea that fiber draws water into the stool so it passes without straining, which he said otherwise raises pressure inside the abdomen⁶⁹.

What all the experts say about fiber

Fruit

In a 2025 video comparing fruits, vegetables and nuts, Rogers said fruit is a better food than most people realize⁷⁰. Most fruits, he noted, have almost no fat or sodium and far more potassium than sodium⁷¹. Its drawback, he said, is that much of its sugar is fructose; he added that McDougall limited fruit to one or two servings a day mainly for older, sicker patients, while young, lean, active people often eat more⁷².

In 2026 he named fruit and starch as the only two good ways to eat carbohydrate in quantity, putting starch first because fruit is seasonal, costly, keeps poorly and is often sprayed to preserve it⁷³. That year he put fruit at about 35% of his own calories⁵². In the debate over whether humans are built to live mainly on fruit or on cooked starch, he sided with McDougall and the evidence that early humans used fire⁷⁴.

What all the experts say about fruit

Vegetables and greens

In a 2026 video Rogers listed the benefits of green vegetables. Their calorie density is very low, about a tenth that of starches, so he said people trying to lose weight should eat them first⁷⁵. Their nitrates are turned by bacteria on the tongue and by stomach acid into nitric oxide, which widens the arteries⁷⁶; he warned that fluoride mouthwash and acid-blocking drugs can break that chain⁷⁷. He said he eats some greens every day, though they give only about 5% of his calories⁷⁸.

What all the experts say about vegetables and greens

Beans and lentils

In a 2022 video on the healthiest bean, Rogers ranked beans by their fat. He named lentils, at about 3% of calories from fat, and black beans, at about 4%, as the best, called chickpeas at about 13% acceptable, and ruled out soybeans at about 40%⁷⁹. He was wary of canned beans because of aluminum and the BPA in can linings⁸⁰, and said gas tends to fade as gut bacteria adjust to the fiber⁸¹.

He also keeps an eye on the protein in beans. In 2022 he wondered whether about a cup a day might be a sensible limit, while saying he was not sure⁸², and in 2023 he called beans good but high in protein⁸³. In 2026 he said he eats some beans every day⁸⁴.

What all the experts say about beans and lentils

Whole grains, bread and flour

Rogers eats white rice rather than brown. In a 2024 video he said brown rice carries more fat, goes rancid more easily, stores less well and holds more arsenic in its outer layer, and that he rinses his rice twice⁸⁵. In 2026 he granted that white rice has lost most of its fiber, but noted that only about 1% of its calories come from fat⁸⁶, and pointed to the leanness of rice-eating peoples⁸⁷.

He rates oats highly for fiber, and in 2026 said he buys pasta only when it is a single-ingredient product, avoiding heavily processed flour⁸⁸. In 2022 he rated oatmeal well, though slightly fattier than the other starches⁸⁹.

What all the experts say about whole grains, bread and flour

Potatoes

Rogers ranks potatoes among the best foods. In a 2024 tribute to McDougall he called them a unique food, about as nutritionally complete as any, with only 1% of calories from fat, and easy to grow even in harsh conditions⁹⁰. In a 2025 video on eating while traveling he called sweet potatoes the healthiest food in the world, and said boiling is all the cooking that potatoes, rice, beans and oatmeal need⁹¹.

What all the experts say about potatoes

Meat

Rogers rejects meat in every form. In a 2025 video on the science of plant-based eating he said meat and processed food are both bad, and that grass-fed organic beef, though better than the conventional kind, is still bad for health⁹². He granted that meat gives a little more creatine and may have a slight muscle-building effect that could help a young athlete, but said that past about 30 it is best to be fully vegan⁹³.

The same year a viewer challenged him to show trial evidence that compounds in grass-fed meat or milk cause cancer. He replied that randomized trials of cancer would take decades⁹⁴, and cited T. Colin Campbell’s work on milk protein and tumor growth to argue that the ideal intake of animal protein is zero⁹⁵.

What all the experts say about meat

Low-fat eating

For Rogers, low fat means under 10% of calories from fat; in 2025 he complained that studies from elite universities often call 30% fat low⁹⁶. In a 2026 video he argued that a low-fat vegan diet is plainly better than the Mediterranean, paleo, keto and carnivore diets⁹⁷. He pointed to the large populations that live mainly on starch⁹⁸, and to Walter Kempner, who he said fed patients about 3% of calories from fat and cured obesity, high blood pressure, diabetes and heart disease⁹⁹. Citing David Blankenhorn and Nathan Pritikin, he said every kind of fat adds to artery disease¹⁰⁰, and that polyunsaturated fats promote blood clots even more than saturated fat¹⁰¹.

In another 2026 video, summing up a McDougall talk he endorsed, he said the fat people eat ends up as body fat, makes red blood cells clump, which raises blood pressure, and is the main cause of insulin resistance¹⁰². He called a low-fat, low-sodium vegan diet without oil the best diet in the world¹⁰³.

What all the experts say about low-fat eating

Saturated fat

In a 2026 lecture on dietary fats Rogers said Ancel Keys showed in the 1950s that saturated fat strongly promotes atherosclerosis, a finding he said was confirmed from the Seven Countries Study to the MRFIT trial, and he dismissed low-carb advocates who deny it¹⁰⁴. In another 2026 lecture he focused on saturated fat as a cause of dementia, while adding that he also sees problems with omega-6, omega-3 and monounsaturated fats¹⁰⁵. He does not treat it as the only culprit: that year he said polyunsaturated fats promote clotting even more¹⁰¹.

What all the experts say about saturated fat

Cholesterol

In a 2026 lecture on heart disease Rogers said LDL cholesterol is one of the molecules that make red blood cells stack together, thickening the blood and promoting high blood pressure and artery disease¹⁰⁶. He called claims that saturated fat and cholesterol do not cause atherosclerosis the opposite of the truth¹⁰⁷. The number he watches is total cholesterol: citing the Framingham study, he said people who keep it below 150 almost never have coronary events¹⁰⁸.

He is critical of statins. In a 2026 video he called them mitochondrial inhibitors that may raise the risk of diabetes, and said giving up fatty food is the better route¹⁰⁹.

What all the experts say about cholesterol

Carbohydrates and low-carb diets

In a 2026 video Rogers called paleo, keto, carnivore and low-carb diets a joke¹¹⁰. He said the most useful thing he has learned as a doctor is that people who eat mainly starch end up healthy¹¹¹. Starch, which he describes as glucose wrapped in fiber, fills the stomach and releases its glucose slowly, he explained, while simple sugars without fiber make blood glucose spike and then crash¹¹². He holds that dietary fat, not carbohydrate, is what blocks the insulin receptor and leads to diabetes¹¹³.

What all the experts say about carbohydrates and low-carb diets

Gluten and wheat

In a 2025 lecture on autoimmune disease Rogers said most people have no problem with gluten, but that he would avoid it in the setting of autoimmune disease¹¹⁴. He said gluten-related disease has tripled in about 15 years, too fast to be genetic, and linked this to glyphosate binding to gluten in non-organic grain and making it more harmful¹¹⁵. He still eats wheat pasta when it is a single-ingredient product⁸⁸.

What all the experts say about gluten and wheat

Coffee, tea and caffeine

In a 2026 lecture Rogers said coffee is a good test of whether a nutrition expert knows the subject¹¹⁶, because caffeine mimics the stress response and raises cortisol¹¹⁷. He cited studies in which a standard 250 mg dose cut blood flow to the brain by roughly 22% to 30%¹¹⁸, and linked caffeine to high blood pressure and insulin resistance, the two conditions he finds in most of his patients with dementia¹¹⁹.

He allowed a cup for a tired driver facing a long trip, but said regular use harms sleep¹²⁰. He said he took up coffee as a sleep-deprived surgical intern and quit years ago, and is glad he did¹²¹. On tea, he dismissed claims for green tea as a wonder food and warned that tea leaves tend to gather fluoride and aluminum¹²².

What all the experts say about coffee, tea and caffeine

Alcohol

Rogers advises against alcohol. In a 2026 video he said alcohol clearly raises the risk of type 2 diabetes¹²³, which he explains through fat building up in muscle, liver and pancreas¹²⁴. In another 2026 lecture he said cooking oils and alcohol are common and powerful causes of brain damage through lipid peroxidation, and recommended avoiding both entirely to lower the risk of dementia¹²⁵¹²⁶.

What all the experts say about alcohol

Chocolate

Rogers does not eat chocolate. In a 2024 video he cited a recent Consumer Reports test of 48 chocolate products¹²⁷ in which every one contained some lead and cadmium, about a third went past the magazine’s level of concern, and dark chocolate, with more cacao, tended to be worse¹²⁸. Adding that chocolate is loaded with sugar and fat, he said he would never eat it¹²⁸. In 2025 he called it high-fat, highly processed junk food that is often high in lead and cadmium¹²⁹, and said he avoids powdered foods such as cocoa because of contaminants¹³⁰.

What all the experts say about chocolate

Juicing and smoothies

Rogers is cool on juicing and blending. In a 2022 video he called juicing overrated, a supposed quick fix with some short-term benefits, and objected above all to the noise of blenders and juicers, which he said can damage hearing¹³¹. In a 2026 video he said whole foods are better, but that if a blender helps someone eat more plants, that is a good thing¹³²; he advised a glass jug, since he said plastic ones shed microplastics into the food¹³³. The same year he said blending a smoothie strips out most of the fiber¹³⁴.

In 2025 he said he was uneasy about carrot juice after seeing that one large bottle held about eight times the daily allowance of vitamin A¹³⁵, a concern because fat-soluble vitamins build up in the body¹³⁶. He does drink beet juice before workouts and long lectures¹³⁷.

What all the experts say about juicing and smoothies

Organic food and pesticides

In a 2026 talk on a chapter of his book The Medical Reformation, Rogers said organic food is worth it¹³⁸. He noted that Esselstyn and McDougall do not stress organic food, and found that reasonable, since a low-fat vegan diet does most of the good and organic food costs more¹³⁹; still, he said organic is better for those who can afford it, and cheaper than often implied¹⁴⁰. His concerns are herbicides and pesticides, above all glyphosate on non-organic soy and beans¹⁴¹, and genetically modified crops, which organic rules exclude¹⁴². He added that organic junk food, such as oily organic chips, is still junk¹⁴³.

What all the experts say about organic food and pesticides

Mediterranean diet

Rogers is one of the sharpest critics of the Mediterranean diet in this guide. In a 2026 talk on preventing heart attacks he called belief in it the most common pitfall he sees, and said “The Mediterranean diet is the Antichrist diet” because it promises salvation but fails to deliver¹⁴⁴. In another 2026 video he said it usually runs to about 40% of calories from fat, with plenty of nuts and seeds¹⁴⁵.

He grants it some merit. In 2026 he called it a vague term whose main rule is to avoid processed food, and said a plant-based version will help people live longer than the standard American diet¹⁴⁶. In his own 30s he lost part of his extra weight on a roughly Mediterranean diet before turning to McDougall’s starch-based approach¹⁴⁷.

What all the experts say about mediterranean diet

Weight loss

Rogers has lost weight on a starch-based diet himself. In a 2026 video he said he reached 220 pounds in his 30s, at 5 feet 9 inches¹⁴⁸, lost part of it on his own and the rest after learning about McDougall’s Starch Solution, ending near 154 pounds, helped by a move to a house where he could exercise more¹⁴⁹.

In a 2025 talk on his book Prevent and Reverse Obesity he said the key to lasting weight control is to get most calories from starch, about 90% for beginners and at least 60%¹⁵⁰, noting that the lower a population’s fat intake, the leaner it is¹⁵¹. Starch, he said, fills the stomach early and releases its glucose slowly, so hunger is met with the fewest calories¹⁵². He recalled that willpower alone had failed him for three or four years before he read about starch diets¹⁵³.

What all the experts say about weight loss

Cravings and food addiction

Rogers sees processed food as addictive. In a 2026 talk from his obesity book he said hyperpalatable processed foods hook people so that plain plant foods taste bland, and endorsed the idea of The Pleasure Trap, by Doug Lisle and Alan Goldhamer, that a period of fasting resets the taste buds¹⁵⁴. In a 2025 obesity lecture he blamed added glutamate (MSG and similar) in processed food for getting people hooked¹⁵⁵. In 2026, recounting a talk with an internist friend, he described the split between Chef AJ, who holds that people get addicted to foods, and McDougall, who disagrees, and said he thought The Pleasure Trap was a good book¹⁵⁶.

What all the experts say about cravings and food addiction

Exercise

In a 2026 video Rogers said exercise becomes a must with age¹⁵⁷. On days off he walks about 7 miles in roughly two hours, reading a book on a treadmill at about 3.3 mph and speeding up near the end¹⁵⁸. A main reason, he said, is sleep: effort builds up adenosine, which drives sleep, while caffeine blocks it¹⁵⁹.

Closing his obesity book in a 2025 lecture he urged at least a daily walk and small habits such as taking the stairs, parking farther away or carrying books in a backpack worn on the front⁵⁸. In a 2026 talk on dementia he called daily exercise one of the easiest things anyone can do to protect the brain¹⁶⁰.

What all the experts say about exercise

Heart disease

Rogers, whose own vascular experience comes from balloon angioplasty, stenting and reading images, says the first step to preventing a heart attack is to learn from Caldwell Esselstyn¹⁶¹. In a 2026 video he said Esselstyn’s core message, that a low-fat diet lets the artery lining make more nitric oxide, which widens vessels and stops platelets from clumping, is enough for most patients who act on it¹⁶²; his own books, he said, add the finer detail¹⁶³.

In another 2026 video, citing autopsy findings, he said artery disease runs through the whole coronary tree, and that plaques under the microscope look like layered blood clots¹⁶⁴. In 2025 he called a whole-food, low-fat vegan diet without oil the best diet for the coronary arteries²⁴.

What all the experts say about heart disease

High blood pressure

Rogers puts potassium ahead of sodium. In a 2026 video he said raising potassium matters more than cutting sodium¹⁶⁵, and that lower sodium brings only a modest benefit until intake falls to about 500 mg a day or less, as Walter Kempner showed¹⁶⁶. Following Richard Moore’s book The High Blood Pressure Solution, he said the diet should hold at least five times more potassium than sodium, a ratio fruits and vegetables far exceed¹⁶⁷.

He rejects the usual explanation that high blood pressure among African Americans is genetic salt sensitivity, blaming mainly diets low in potassium¹⁶⁸. He also blames dietary fat: in 2026 he said fat and LDL make red blood cells stick together, so the thickened blood needs more pressure to reach the brain¹⁶⁹.

What all the experts say about high blood pressure

Diabetes

Rogers calls type 2 diabetes a dietary disease that pills cannot cure¹⁷⁰. Introducing his book Prevent and Reverse Diabetes in 2026, he said all type 2 diabetes can be cured, and that type 1 and other forms can be much improved by avoiding high-fat diets and toxins¹⁷¹. The book opens with a note that people on drugs for diabetes, blood pressure or blood thinning should tell their doctor, since doses usually have to come down on a low-fat vegan diet¹⁷².

He explains the disease through fat stored in the wrong places. Drawing on Gerald Shulman’s work at Yale, he said in 2026 that fat builds up first in muscle, causing insulin resistance¹²⁴, then in the liver, raising fasting glucose, and finally in the pancreas, where it destroys the cells that make insulin¹⁷³.

What all the experts say about diabetes

Cancer

Rogers puts diet at the center of cancer prevention. The first item on his 2022 cancer prevention checklist was to eat nothing from an animal, including dairy, fish and eggs¹⁷⁴. He said animal protein supplies more methionine, which acidifies the tissues and which cancer cells need¹⁷⁵, plus more leucine and lysine, which switch on the growth signal mTOR, and raises the growth factor IGF-1¹⁷⁶. He cited T. Colin Campbell’s view that animal protein acts above all as a tumor promoter¹⁷⁷.

In 2026 he reported a mouse study in which a ketogenic diet slowed the original breast tumor but increased its spread to the lungs¹⁷⁸, and said that, from what he knows of nutrition, keto for cancer is a foolish idea¹⁷⁹.

What all the experts say about cancer

Dementia and the brain

Rogers has his own theory of dementia. In a 2026 lecture he said neurons die when their energy demand is pushed up while their blood flow falls and their mitochondria are blocked, which he calls the Rogers supply and demand theory¹⁸⁰. He doubts that most cases labeled Alzheimer’s disease are a real entity, saying the diagnosis cannot be made reliably in life and is overstated in the research literature¹⁸¹.

In a 2026 talk on risk factors he named a sedentary life, obesity, high-fat diets, processed food and high blood pressure¹⁶⁰¹⁸². In other 2026 lectures he tied brain damage to caffeine, which he said lowers blood flow to the brain¹¹⁸, and to alcohol and cooking oils through lipid peroxidation¹²⁶.

What all the experts say about dementia and the brain

Longevity and aging

In a 2026 video Rogers said a low-fat, whole-food, plant-based diet, organic only, gives a good chance of reaching 90, ideally fully vegan and at least 90%¹⁸³. In his 2022 cancer checklist he argued that meat speeds aging by pushing cells to divide faster, so they reach their limit of about 60 divisions sooner¹⁸⁴.

In 2026 he said women outlive men largely because menstruation lowers their red blood cell count, thinning the blood and cutting atherosclerosis risk¹⁸⁵, while men tend to build up too much iron¹⁸⁶.

What all the experts say about longevity and aging

Each small number links to its reference at the bottom of the page: the video at the exact second, or the page where it was said.