In India, arguments about food rarely stay about food. Vegetarianism is bound up with faith, family and region, and newer imported camps have added their own certainty. Strict vegans insist that removing animal products is the only clean and moral way to eat. Carnivore-diet enthusiasts insist the opposite: that virtually every plant is armed with toxins the human body was never built to handle. Both camps argue with total certainty. Both are, biologically speaking, half right.

The real question is not which side wins. It is how the human immune system actually responds to what lands on the plate, and what that means for how food should be chosen, combined, and prepared.

An Old Kinship, and its Cost

Humans are animals, which means our cells share deep structural similarities with the cells of goats, cattle, chickens, and fish: the same membranes, many of the same proteins, the same basic machinery. That closeness should, in theory, make animal tissue easy for the immune system to wave through as harmless. In practice it creates a strange liability. When a foreign protein looks almost, but not quite, like a human one, the immune system can become confused and start attacking both. Scientists call this molecular mimicry.

The clearest example involves a sugar molecule called Neu5Gc, present in the flesh of most mammals but absent in humans, who lost the ability to make it somewhere in our evolutionary past. Because Neu5Gc so closely resembles a sugar the human body does produce, ingested Neu5Gc from red meat is absorbed into our own tissues, where circulating antibodies then attack it, and by extension the tissue it has settled into. 

Researchers at the University of California, San Diego first documented this mechanism in mice over a decade ago, and a 2024 study from Jilin University in China replicated and extended the finding, confirming that Neu5Gc exposure measurably raises inflammation and antibody production. The honest caveat, often left out of headlines: large human cohort studies, including the Nurses' Health Study, have not found the same antibodies reliably predicting heart disease or colorectal cancer risk in people. The mouse evidence is strong; the human evidence is still catching up.

Plant-Based Foods Have Their Drawbacks

Evolutionary distance cuts the other way for plants. Unable to run from predators, plants evolved a chemistry set of their own: lectins that can irritate the intestinal lining, oxalates that can crystallize into kidney stones, phytates that block mineral absorption, and fermentable carbohydrates known as FODMAPs that can trigger real digestive distress in people with sensitive stomachs. 

Plant pollens and proteins also drive a well-documented cluster of cross-reactive allergies. None of this makes plants dangerous for most people. It does mean that “plant-based” is not automatically synonymous with “gentle.”

Vitamin B12 Inadequacy

None of this is an argument for abandoning plants. Fiber remains one of the most under-consumed nutrients in modern diets. In the United States, federal dietary guidelines put compliance at roughly 5 percent of adults, and a 2025 industry survey found 29 percent of Americans eating under 20 grams a day. 

That matters because bacteria in the digestive tract ferment fiber into short-chain fatty acids, especially butyrate, which feeds colon cells, repairs the intestinal lining, and helps train regulatory T-cells, the immune system's own peacekeepers. A fiber-starved digestive system is a more reactive one.

Animal foods, meanwhile, remain unmatched for delivering B12, retinol, heme iron, and long-chain omega-3s in forms the body absorbs easily and without antinutrient interference. The cost of skipping them shows up in the data: a systematic review in Nutrition Reviews found that 52 to 86 percent of vegans who do not take a Vitamin B12 supplement test deficient, a gap no amount of leafy greens closes. India, home to the world's largest vegetarian population, is living this gap: Indian studies find inadequate B12 in about half the population and roughly two-thirds of vegetarians.

Rise of Ultra-Processed Foods

The most overlooked variable is preparation. Soaking rajma overnight, sprouting moong, fermenting idli and dosa batter, and slow-cooking dal deactivate lectins, cut phytates, and make legumes far easier to digest. Indian kitchens arrived at these habits long before anyone named a lectin. 

The same kitchens handled meat with similar sense. Marinating in curd, turmeric, and ginger-garlic, then simmering in a gravy, avoids much of the high-heat charring that creates heterocyclic amines, compounds linked to cancer risk; a Kansas State University study found that turmeric, rosemary, and fingerroot cut their formation in cooked beef by about 40 percent. 

And much of India's non-vegetarian eating relies on chicken, fish, and eggs, which carry little or no Neu5Gc, a sugar found mainly in mammalian meat, with mutton usually served as a modest portion in a curry rather than as a slab of steak. Packaged convenience food is now replacing all of this. 

India's Economic Survey 2025-26 notes that retail sales of ultra-processed food rose from about $0.9 billion in 2006 to roughly $38 billion in 2019, a period in which obesity rates nearly doubled. America shows where that road ends: a 2025 CDC report found ultra-processed food now supplies 53 percent of adult calories there.

Case for Balanced Food Choices

Biology does not reward tribal loyalty. A person managing autoimmune disease or an unhealthy balance of intestinal bacteria may do better, at least temporarily, on nutrient-dense animal protein and broths with fewer plant irritants. A person with a healthy, diverse microbiome will likely thrive on a fiber-rich, well-prepared, plant-forward diet. Neither answer is universal, and neither side of the diet wars has a monopoly on the truth.

India's Supreme Court is now deciding whether packaged foods high in sugar, salt, or fat must carry red warnings on the front of the pack. It should require them from the first day. A year of voluntary compliance is a year in which the packet keeps beating the kitchen.

Pairing well-sourced animal protein with properly prepared plant food, rather than picking a side, is simply what biology has been saying all along.

(The author is the Director of the Reddy Center for Critical and Integrated Thinking. A former R&D executive holding 30 U.S. patents, he specializes in interdisciplinary research and public policy analysis. He hosts the show SAM Dialogues with Dr. M. P. Reddy on South Asia Monitor. He can be reached at mpreddy54@yahoo.com, https://lnkd.in/gn2zQJbs)