Autoimmune Diseases: Red Meat, Gluten, and Ultra-Processed Foods

From the Paleolithic to sliced bread: the diet blamed for everything

A man cuts bread and refined flour products from his diet. He changes nothing else: no gym, no schedule, no exercise routine. A year later, he has lost 10 kilos, gained muscle, and sleeps better. This first-person account is one of the most cited examples in a conversation open for 926 days, sparked by a simple image: the diet recommended by the medical community versus that of a man from 30,000 years ago.

The underlying question is significant. Why are autoimmune diseases, heart attacks, allergies, and cancers surging? Answers range from gluten to microplastics, from red meat to sedentary lifestyles, and almost none admit to a clean study that closes the case.

The image opening the discussion: two food pyramids

The scene is amusing: above, the official pyramid places sweets and pastries at the peak; below, a prehistoric menu of hunting, offal, and animal fat. From this arises the first accusation: that the pyramid is inverted or manipulated. Some argue the base should be vegetables and fruits, with meats and fish at the second level, and carbohydrates below. Others go further, claiming the base should be red meats and offal, vegetables are emergency food due to anti-nutrients, and excessive fruit also takes its toll.

The deeper attribution is more uncomfortable: it is claimed that the food and pharmaceutical industries have no interest in a healthy population. This suspicion repeats often but lacks any proof in the reviewed material.

Why was prehistoric life expectancy said to be 30 years?

Because it is calculated wrongly, by purpose or ignorance: the average includes children who died before turning one. The arithmetic example given is: in a population of two people, if one dies in the first month and the other lives 80 years, the resulting life expectancy is 40. Nothing more.

The data suggest an infant mortality rate of between 30% and 40% before age 15 in the Paleolithic, and that those who survived this filter could reach 70. The most likely age of death is 72 years, according to cited sources. The star counterargument is Ötzi: 46 years with an arrow as the cause of death. The conclusion drawn is that the average misleads and that modern medicine, not dietary longevity, has brought most to 80.

Is red meat as carcinogenic as tobacco?

Here the disagreement is frontal. One side notes that red meat has been classified as carcinogenic since 2012 and denying this is like denying tobacco kills. The other responds that this classification relies on epidemiological studies, i.e., questionnaires to thousands of people about weekly meat consumption, crossed with their health history.

The technical nuance matters: the cited documents themselves speak of probably carcinogenic risk for red meat, not certainty, and mix association with biological mechanism. With this material, claiming a steak and a cigar are equivalent is a simplification, as is claiming there is no relationship. What little discussion remains in the material is the declared interest in orienting consumption toward vegetables and cereals, and that this interest has conditioned research for decades.

Gluten, the gut, and autoimmune diseases: the recurring hypothesis

The most widespread explanation among those defending the grain-free diet is this: gluten contains gliadin, a prolamine that would damage gut flora and then the small intestine epithelium. With this barrier altered, elements that should not pass enter the blood, and the immune system attacks own tissues via cross-reaction. Depending on where it strikes, arthritis, sclerosis, rosacea, or thyroiditis may appear.

This is a suggestive and widely spread hypothesis. It is also worth remembering that those who support it do so from personal experience, not from a clinical trial demonstrating it for the general population. Any such symptom belongs in a medical consultation, not an internet argument.

The problem of measuring diet: epidemiology vs. controlled trials

The most solid point in the entire discussion is methodological. A serious study would require locking a group of people for ten years with controlled food, and that is not done. What exists are correlations: if someone eats meat, they also smoke less or more, exercise or not, drink or not, live in a clean environment or not. None of this can be isolated.

From this come two widely cited episodes. That of Ancel Keys, who allegedly hid data contradicting his cholesterol thesis, and whose original records remain. And that of two Harvard researchers who, according to this version, received $50,000 of the time to steer conclusions toward sugar. With this history, distrust of the official nutritional narrative is justified; what is not justified is replacing it with another closed narrative.

Refined flours, ultra-processed foods, and the homemade bread experiment

Another current shifts focus from the macro-food to processing. The argument is that the glycemic disaster appears when traditional cooking is industrialized: the case of corn in Mexico, fermented by nixtamalization for centuries and later converted to refined flour, is cited as an example. Several personal accounts insist on the same: eliminating commercial flour products and making bread at home, with a bread maker and oven, is enough to lose weight without touching the rest.

The list of usual suspects is completed with microplastics, fish mercury, pesticides, alcohol, tobacco, and refined sugar. And with a factor almost no one disputes: sedentary lifestyle. The phrase summarizing this part is harsh: some do not walk a kilometer in a month. The complete calculation of how energy expenditure is distributed between Paleolithic hunting and an office day allows for a surprising comparison.

Genetics as the last stronghold

Amidst so much theory, the hardest experience to refute is that of someone who did nothing right and lived 99 years, with only three doctor visits in their life and a firm hobby for sweets. His four daughters, all octogenarians, without diagnosed disease. With cases like this on the table, the hereditary hypothesis gains ground and leaves diet in a secondary role.

And so it all remains, unclosed. With 283 accumulated responses, no one has presented the study separating meat from sugar, gluten from sedentary lifestyle, or genetics from luck. The only thing clear is that autoimmune diseases, heart attacks, and allergies have multiplied while shopping baskets filled with packaging.