#94 – Mark Hyman, M.D.: The impact of the food system on our health and the environment

KEYPOINTS

• 01

  Hyman frames ultra-processed food as a health, economic and climate problem at once

  Hyman, a functional medicine physician, cites 11 million deaths a year worldwide from eating too much ultra-processed food and too little good food. He says 70% of US military recruits are rejected as unfit. He also cites a UN projection of 200 million to a billion climate refugees within the coming decades. In his view the food system connects chronic disease, healthcare costs, national security and the environment.

• 02

  Calories aren't biologically equivalent, he argues

  Hyman's example: 750 calories of soda is a Big Gulp holding 46 teaspoons of sugar, while 750 calories of broccoli is 21 cups with 35 grams of fiber and no sugar. He says ultra-processed food now makes up about 60% of American calories, and that each additional 10% of calories from it raises death risk by 14%, as he reports the data. Peter adds that processed foods may hijack the body's normal appetite feedback loop.

• 03

  He says the food industry funds confusion

  Hyman cites about $12 billion spent by the food industry on nutrition 'research.' He describes how Coca-Cola executive Rhona Applebaum set up the Global Energy Balance Network. He says it paid scientists including James Hill, with about $20 million in funding, to push 'all calories are the same' and 'exercise more, eat less.'

• 04

  Gut health sits at the center of his model of inflammation

  Hyman says low-fiber, high-sugar diets feed harmful microbes, damage the gut lining ('leaky gut') and let food antigens trigger inflammation, noting that about 60% of the immune system is in the gut. He cites rodent experiments in which transferring stool from lean to obese animals changed their weight. He adds that stress alone can increase gut permeability.

• 05

  US health statistics he calls staggering

  Hyman says 6 in 10 Americans have a chronic disease and 4 in 10 have two or more. One in two has prediabetes or type 2 diabetes, about 75% are overweight, and most states are near 40% obesity, whereas no state had 20% when he finished medical school. He says 80% of the world's type 2 diabetics now live in developing countries, and some ethnic groups face higher risk at lower body weights.

• 06

  Policy works, and the tobacco playbook is being reused

  Hyman points to Chile, where a senator who was also a doctor pushed through warning labels on unhealthy foods, marketing limits and a soda tax. He says marketing restrictions and labels had about four times the impact of the tax. Peter recalls that requiring anti-smoking ads alongside cigarette ads led tobacco companies to pull their TV ads. US adult smoking fell from about 50–55% in the mid-1960s to about 18%.

• 07

  Fertilizer and tillage degrade soil, Hyman argues

  Hyman says global fertilizer use is 400 billion pounds, sevenfold higher than 40 years ago yet two-thirds as effective. It is made from fracked natural gas, emits nitrous oxide, which he calls about 300 times more potent than CO2, and runs off into roughly 400 ocean dead zones, including one the size of New Jersey in the Gulf of Mexico. He claims a third to 40% of excess atmospheric carbon comes from lost soil.

• 08

  Regenerative agriculture is his proposed fix

  Regenerative farming means cover crops, rotation, minimal tillage and animals or legumes for nitrogen. He says it rebuilds organic matter, holds water and can match yields. Peter notes that US corn yields were flat at about 20 bushels per acre from the Civil War to World War II, then climbed to about 200 before GMOs arrived. GMOs, added perhaps about 10% more, a figure Peter says may be debatable.

• 09

  Glyphosate: Hyman is alarmed and Peter isn't convinced

  Hyman says glyphosate is 70% of agrochemicals used, weeds are becoming resistant, there are about 14,000 lawsuits, and animal studies show microbiome and epigenetic effects. He says his own urine glyphosate was at the 50th percentile on a Great Plains Lab test. Peter eats similarly but says he is far less confident that glyphosate causes human disease than that tobacco causes lung cancer, because the data haven't convinced him.