The Architecture of Our Decline

She's 46. She's exhausted by two in the afternoon, foggy enough that she's started writing everything down, and carrying thirty pounds she can't account for because, as she puts it, "I barely eat." Her doctor told her the labs were normal. Her fasting glucose was 98, technically fine. Her fasting insulin, which nobody had ordered, was 19 — way above a healthy level. Her body had been working overtime for years to keep that glucose number looking normal.

I see a version of her almost every week. In nearly 28 years of practice, the details change: sometimes it's a man in his thirties whose testosterone is gone, sometimes a young couple who can't conceive, sometimes a retiree who's frightened by his memory loss. The pattern underneath is the same, and it has only become more common, and the patients have only become younger.

This is not a story about personal failure. It's a story about an environment. Our modern food supply has become fundamentally incompatible with human biology, and the result is a slow-motion emergency hiding in plain sight.

There are two easy ways to get this wrong. One is the food and pharmaceutical industries' line: nothing is wrong with the products, people just need to make better choices (and here's a prescription). The other is the well-meaning cultural instinct to avoid talking about metabolic risk at all, for fear of shaming anyone. Shame doesn't help a single patient. But neither does pretending insulin resistance is harmless. Between those two errors is an honest conversation, and it starts with the numbers.

The quiet emergency

According to the CDC's most recent national survey, about 40% of American adults now have obesity, and roughly another 32% are overweight. That's nearly three in four adults. About 40 million Americans have diabetes, and another 115 million adults have prediabetes, most of whom don't know it.

These aren't dry actuarial numbers for public health officials to file away. They're the clinical signature of a population whose underlying metabolism is failing. No war or crime wave in American history has touched this many lives, and almost none of it makes the evening news because it happens slowly, one fasting insulin at a time.

I also think we've gotten strangely numb to it. We market sugary cereal to toddlers with cartoon characters, then treat it as bad genetic luck when a ten-year-old develops fatty liver disease. We have powerful lobbies for nearly every industry in this country. Where is the safe-food lobby? Where is the lobby for knowing what's actually in what we eat?

Food that hijacks the brain

Human beings have always used substances to change how they feel, and food is the oldest of them. What's new is food engineered to do it on purpose.

Ultra-processed foods are built around combinations rarely found in nature: sugar plus fat plus salt, in textures that melt away before your fullness signals can catch up. They trigger dopamine release in the brain's reward center, the nucleus accumbens. That's the same circuitry that evolved to make our ancestors chase scarce calories. The dopamine response to food is much smaller than to a drug like cocaine, but it fires five or six times a day, every day, for decades.

Some brain-imaging research suggests that over time the reward system becomes less responsive, so it takes more to feel the same satisfaction. The human evidence is still mixed. But the pattern my patients describe, cravings that feel less like hunger and more like compulsion, fits it well.

It's worth noticing how differently we treat other substances that change brain chemistry. At Johns Hopkins, researchers studying psilocybin for depression screen every participant carefully, prepare them with trained therapists, give the drug only once or twice in a controlled setting, and follow up closely. In their 2021 randomized trial, two supervised sessions with supportive therapy cut depression symptoms by half or more in about two-thirds of participants.

That's what responsible use of a powerful, brain-altering substance looks like: intentional, rare, supervised and studied. It has real pitfalls too. The FDA declined to approve MDMA-assisted therapy for PTSD in 2024 and asked for more data, which is exactly why careful research matters. I'll be writing more about both the promise and the pitfalls.

Now compare that with the snack aisle. Products engineered to alter brain chemistry, eaten several times a day from infancy, with no screening, no supervision and almost no scrutiny of how they affect us over a lifetime. We hold a mushroom compound to a far higher standard than a bag of chips.

The brain runs on the same broken fuel line

Every glucose spike calls for insulin. Spike it often enough, for long enough, and the body's cells stop listening to insulin. That's insulin resistance, and it doesn't stop at the neck. The brain itself can become insulin resistant.

When that happens, brain cells struggle to use glucose efficiently even when plenty is circulating in the blood. Researchers can see this on PET scans as reduced glucose use in key brain regions, and it shows up years before memory problems do. Add the chronic, low-grade inflammation that travels with insulin resistance, and you have a recognized risk factor for depression, cognitive decline and Alzheimer's disease. Some researchers now call Alzheimer's "type 3 diabetes" for exactly this reason.

Think about what that does to an ordinary day. We spend real money and years of effort trying to think clearly, focus deeply and be present with the people we love. Trying to do that with a brain that's inflamed and underfueled is like trying to map a distant star system through a telescope smeared with mud, on a mount warped by heat. We are asking the most sophisticated organ on earth to do its best work while feeding it the wrong fuel.

A fertility alarm

The most sobering consequences show up in reproduction. A 2022 analysis of 223 studies covering more than 57,000 men found that average sperm concentration fell by about half between 1973 and 2018, and that the decline has sped up since 2000. Some experts argue that changes in lab counting methods explain part of it, and the study didn't examine causes. Lifestyle and environmental chemicals are the leading suspects, and metabolic health is clearly part of that picture.

In women, polycystic ovary syndrome (PCOS) is the most common cause of infertility from irregular or absent ovulation. Insulin resistance sits at the center of most cases. High insulin levels push the ovaries to make extra testosterone and related hormones, and they lower the protein (SHBG) that normally keeps those hormones in check. The result is disrupted follicle development and ovulation that becomes irregular or stops.

In men, excess body fat carries more of the enzyme aromatase, which converts testosterone into estrogen. Lower testosterone and higher estrogen mean less sperm production and poorer sperm quality.

The encouraging part, and the part I see in practice, is that much of this responds when metabolism improves. These are not fixed sentences.

GLP-1 drugs: a tool, not a cure

The new GLP-1 medications, semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro, Zepbound), are genuine triumphs of biochemistry. They quiet "food noise" by acting on appetite centers in the brain and slow the emptying of the stomach. For many people they are life-changing, and I'm not here to shame anyone who uses one.

But look at what happens when people stop. In the STEP 1 trial, people on semaglutide lost about 17% of their body weight over 68 weeks. A year after stopping the drug, they had regained about two-thirds of it, and most of their improvements in blood pressure, blood sugar and cholesterol drifted back toward where they started.

That's not a cure. It's a subscription, and a lucrative one. Tirzepatide became the top-selling drug in the country in 2025, with nearly $63 billion in U.S. wholesale purchases. Nobody earns that kind of money from a population that fixes its metabolism and no longer needs the drug.

Used well, these medications can buy someone time and momentum while they rebuild the foundations: food, muscle, sleep and movement. Used as a substitute for those foundations, they let the environment that caused the problem carry on untouched, while we pay to manage the symptoms indefinitely.

Who wrote the rules

None of this happened in a vacuum. The agencies charged with protecting our food supply have long been entangled with the industries they oversee, and we have the paper trail.

In 2016, researchers at UC San Francisco published internal sugar industry documents in JAMA Internal Medicine. They showed that in the mid-1960s, a sugar trade group paid Harvard scientists the equivalent of about $50,000 in today's money to write a review on diet and heart disease. The industry set the review's goal and supplied articles to critique. The review, published in the New England Journal of Medicine in 1967 without disclosing the funding, downplayed sugar and pointed the finger at dietary fat.

That thinking shaped decades of advice. The 1992 Food Guide Pyramid put 6 to 11 daily servings of bread, cereal, rice and pasta at its base, while fats were treated as the enemy. The guidelines' daily cap on dietary cholesterol wasn't dropped until 2015.

It's not ancient history. An analysis published in Public Health Nutrition found that 95% of the members of the committee advising the 2020 Dietary Guidelines had conflicts of interest with the food or pharmaceutical industries, including companies like Kellogg, Kraft and General Mills.

The result is a system with a bitter circularity. We tax people to subsidize the corn that ends up as syrup in their soda, then tax them again to pay for the drugs that manage the diabetes.

What you can do starting this week

We are wired to chase quick rewards, and we can't simply willpower our way out of an environment built to exploit that. The answer is to change the environment, starting with the one you control: your own kitchen, your own calendar, your own body.

1. Change your surroundings, not just your resolve. Keep ultra-processed foods out of the house. If a product has an ingredient list you couldn't make in your own kitchen, it's a treat, not food.
2. Build meals around protein and plants. Protein and fiber at every meal blunt glucose spikes and keep you full far longer than refined carbohydrates.
3. Walk after you eat. Even 10 to 15 minutes of easy walking after a meal measurably lowers the blood sugar spike that follows.
4. Lift something heavy. Muscle is the body's largest storage tank for glucose. More muscle means more room to put sugar where it belongs.
5. Protect your sleep. Even a few nights of short sleep make your cells more insulin resistant.
6. Get the right labs. A "normal" fasting glucose can hide years of trouble. Ask for fasting insulin, hemoglobin A1c, a HOMA-IR calculation, a full lipid panel (look at the triglyceride-to-HDL ratio), and hs-CRP for inflammation. Measure your waist, too.

Want to know where you stand? Start with the Metabolic Assessment Form, the same questionnaire my functional medicine patients fill out. Get the free Metabolic Assessment Form and a simple scoring sheet, and I'll walk you through one section a week by email, including what blood work can show and what you can try at home.

We can't wait for the institutions to fix this. Metabolic health isn't a cosmetic choice. It's the foundation for clear thinking, steady moods, healthy children and a long life. The clock is running, but it hasn't run out, and the best time to start is now.

To your health, Dr. Matt Wilding

Sources

• CDC/NCHS, Prevalence of overweight, obesity, and severe obesity among adults, 1960–1962 through August 2021–August 2023
• CDC, National Diabetes Statistics Report
• Davis AK et al., Effects of Psilocybin-Assisted Therapy on Major Depressive Disorder, JAMA Psychiatry, 2021
• Levine H et al., Temporal trends in sperm count, Human Reproduction Update, 2022
• Wilding JPH et al., Weight regain and cardiometabolic effects after withdrawal of semaglutide: the STEP 1 trial extension, Diabetes, Obesity and Metabolism, 2022
• ASHP drug spending report, via USA Today/Yahoo Finance, 2026
• Kearns CE et al., sugar industry and heart disease research, JAMA Internal Medicine, 2016 (UCSF summary)
• Mialon M et al., Conflicts of interest for members of the US 2020 Dietary Guidelines Advisory Committee, Public Health Nutrition

This article is for education only and is not medical advice. Talk with your own healthcare provider before making changes to your care.