Each year, every one of us consumes over a ton of food and water.
That ton of raw material is received, broken down, transformed, absorbed, and eliminated by this 60-kilogram flesh-and-bone body. It fuels our energy needs and participates in the construction and repair of our cells.
The human body — so compact in size — manages this massive, intricate metabolic operation day in, day out, tirelessly, for decades.
No factory in the real world could handle that level of throughput and complexity without constant maintenance and tight quality control.
Yet somehow, our bodies run at high capacity for years and even self-repair along the way. It’s nothing short of a miracle.
But let’s not romanticize it too much.
Even the most finely tuned biological machine can’t handle tons of bad input. One ton per year, year after year — it will eventually break down.
No high-tech anti-aging intervention can reverse the chronic damage done by three careless meals a day.
No amount of expensive supplements can offset the long-term burden of a structurally imbalanced diet.
And within that ton of intake, aside from water, the true heavy hitters are the three macronutrients — protein, carbohydrates, and fat. They are the bedrock of vitality and growth, but also the potential drivers of aging and disease.
Over the past two months, I’ve written more than a dozen articles unpacking these three macronutrients — breaking down their biological mechanics and how they play out in practice.
Today, I want to take a step back and look at the bigger picture:
From the lens of aging biology, how do these nutrients either accelerate or slow down the aging process? Where do imbalances show up? And how can we intervene?
I. Protein: The Growth–Aging Paradox
Protein is the raw material of muscle, the bricks and mortar of our organs — but in the context of longevity, it’s the most double-edged of the three.
First, excessive protein, especially animal protein with high bioavailability, strongly activates two major growth factor pathways: mTOR and IGF-1. mTOR is like the “gas pedal” of cellular growth — it drives muscle gain and cell proliferation. But chronically pressing that pedal suppresses autophagy, accelerates tissue wear and tear, and increases cancer risk. IGF-1 plays a similar role: a booster in adolescence, but a burner in midlife and beyond2.
In people aged 50–65, those with high protein intake — especially from animal sources — have significantly higher mortality rates. In fact, cancer mortality is four times higher in this group. Plant protein, on the other hand, does not show the same level of the risk profile3.
Second, protein aggregation is a hallmark of age-related diseases. From Alzheimer’s and Parkinson’s to atherosclerosis, more and more research is pointing to the accumulation of misfolded or aggregated proteins inside cells as a root cause of disease. What’s stopping the cleanup? Mostly, a decline in autophagy — the cell’s own waste disposal system5.
And overactivation of mTOR is a known suppressor of autophagy. The vicious cycle is this: Too much protein → activates mTOR → inhibits autophagy → protein waste builds up → disease shows up earlier2,5.
Third, high protein diets can also impose metabolic burdens. Excess amino acids reduce insulin sensitivity, and nitrogen waste adds load to the liver and kidneys. Short term, you may not feel it. Long term, it becomes a chronic drain6.
II. Carbohydrates: The Sweet Burden of Aging
First, carbs are a metabolic landmine. While they are our primary fuel, they are also the spark behind many modern chronic conditions. Refined carbs — white rice, white bread, soda, pastries — cause sharp spikes in blood sugar, triggering insulin surges. Over time, HbA1c creeps up, insulin sensitivity plummets, and beta cells start to burn out. Insulin resistance sets in quietly, laying the groundwork for type 2 diabetes and metabolic syndrome7.
Second, high-GI/Glycemic Load diets push the liver to produce fat, raising endogenous LDL-C. Over time, this becomes a key trigger for plaque buildup in arteries — escalating the risk of heart disease and stroke, the top killers of our time8.
Third, glycation — the non-enzymatic reaction between sugar and protein — is a classic aging mechanism. It leads to Advanced Glycation End-products (AGEs), which stiffen tissues, impair vascular flexibility, and disrupt cell signaling. Glycation is irreversible and implicated in skin aging, cataracts, atherosclerosis, and cognitive decline9.
In fact, glycation and protein aggregation are two important structural drivers of cellular aging. A high-sugar diet accelerates both.
Fourth, excessive carb intake also indirectly raises IGF-1 levels, further stimulating growth signals that can fuel tumor development and speed up aging10.
III. Fat: Not the Villain, If You Choose the Right Ones
Fat has long been demonized, but we now know better. We need to distinguish two very different things: the fat we eat, and the fat we store.
From a metabolic perspective, dietary fat is actually gentler than protein or carbs. It doesn’t spike insulin or glucose like carbs do. Nor does it overstimulate mTOR or IGF-1 like protein. As a direct aging stimulus, dietary fat may be the least harmful of the three.
But that only holds if you’re eating the right fats.
Zero trans fat is a baseline. Beyond that, watch out for two specific types:
- Palmitic acid, a saturated fat found in red meat, butter, and palm oil — and also synthesized in the liver from high-carb diets. It’s highly pro-inflammatory, induces insulin resistance in fat cells, and promotes systemic low-grade inflammation.
- Omega-6 overload, mostly from refined vegetable oils. When Omega-6 vastly outpaces Omega-3, it fosters a chronic inflammatory environment that drives many chronic diseases.
But fat-related harm doesn’t just come from diet. Stored fat, especially visceral fat, can wreak havoc.
Visceral fat behaves like an active endocrine organ — secreting inflammatory molecules, disrupting insulin sensitivity, and contributing to a phenomenon called inflammaging. In contrast, subcutaneous fat is relatively harmless — and in some cases, even protective.
In a large longitudinal study (n=3,086, age 46–77), each standard deviation increase in visceral fat (~768g) was associated with a 26% higher all-cause mortality risk11.
But again, let’s not blame fat indiscriminately. Much of that visceral fat comes from excessive carb consumption, NOT fat itself.
IV. ✅ Practical Recommendations (for Prime Life practitioners in mid-life and beyond)
Protein
- Favor plant proteins — they’re gentler on mTOR and IGF-1 pathways
- When building muscle, pair resistance training with leucine-rich protein to precisely stimulate growth
- Follow the principle: “Low chronic load, periodic activation”
Carbohydrates
- Avoid free sugars
- Opt for low-GI/GL carbs: brown rice, quinoa, legumes, vegetables
- Eat whole fruits in moderation — leveraging small intestinal absorption of fructose to maintain stable glucose levels
Fat
- Replace inflammatory fats, fast carbs, and red meat with quality fats to reduce metabolic burden and regulate growth signals
- Eliminate trans fats
- Limit intake of palmitic acid (red meat) and Omega-6 (refined seed oils)
And finally — fasting and exercise are two of the most powerful tools in the Prime Life toolbox. They converge on the same metabolic principles:
- Reduce long-term metabolic stress
- Improve insulin sensitivity and metabolic efficiency
- Activate autophagy — which clears dysfunctional elements like AGEs, misfolded proteins, and aging mitochondria. In many ways, autophagy cleans up the structural mess caused by protein and sugar excess.
One More Thing… Back to Why I Started Prime Lab
Over the past few months of sharing Prime Lab, I’ve been asked the same question over and over: “So what exactly are you doing?”
It’s not easy to answer in one word.
Say “anti-aging,” and people jump to stem cells. Say “longevity,” and they ask if I’m pushing NMN.
I get it. Those associations make sense — these interventions are at the frontier of aging science and give us real hope for extending healthspan.
But in my framework, those belong to step three.
Step one is comprehensive, timely baseline diagnostics. Detect disease early, hand it over to the medical system. Disease slashes healthspan instantly. That’s why we spent over a month just talking about testing.
Step two is optimizing lifestyle. Getting the everyday things right — eating, sleeping, exercising, managing emotions and environmental exposure — and doing them right consistently.
These things seem mundane. But done wrong for years, they become chronic poison. Done right, they’re the purest form of medicine. And they’re the most controllable variables in our day-to-day lives.
That’s why I started with nutrition — there’s no way around it. We eat over a ton of food and water every year — and at the heart of that structure lie the Big Three: protein, carbs, and fat.
This piece is a summary of one chapter, but far from the last word. These three will remain close companions in our longevity journey.
I’m also deeply grateful to readers who engage critically and offer thoughtful feedback. For example, one reader pointed out that my earlier claim — “fructose is 100% metabolized in the liver” — wasn’t fully accurate. Upon further research, I found that moderate amounts of fructose are absorbed in the small intestine first, prompting an update to both my knowledge and dietary recommendations. Prime Diet has since expanded its fruit roster beyond just avocado and blueberries.
That’s exactly how it should be. Prime Life is an iterative process — an evolving health experiment shaped by collective participation.
And with kindred spirits on the path, I believe Prime Lab will only keep getting better.
Intervention recommendations are geared toward generally healthy individuals. If you have existing health conditions, always follow your doctor’s instructions.
References11
[1]AI Research
[2]Saxton, Robert A., and David M. Sabatini. “mTOR Signaling in Growth, Metabolism, and Disease.” Cell, vol. 168, no. 6, 2017, pp. 960–76.
[3]Levine, Morgan E., et al. “Low Protein Intake Is Associated with a Major Reduction in IGF‑1, Cancer, and Overall Mortality in the 65 and Younger but Not Older Population.” Cell Metabolism, vol. 19, no. 3, 2014, pp. 407‑17.
[4] The Longevity Code: Cutting-Edge Scientific Secrets for a Longer, Healthier Life, Kris Verburgh — translated by Wang Zhao
[5]Rubinsztein, David C., et al. “Autophagy and Ageing.” Nature Reviews Molecular Cell Biology, vol. 12, 2011, pp. 437–52.
[6]Kalantar-Zadeh, Kamyar, and Denis Fouque. “Nutritional Management of Chronic Kidney Disease.” New England Journal of Medicine, vol. 377, 2017, pp. 1765–76.
[7]Miller, Vincent, et al. “Association of Glycaemic Index and Glycaemic Load with Type 2 Diabetes, Cardiovascular Disease, Cancer, and All-Cause Mortality: A Meta-analysis of Mega Cohorts.” The Lancet Diabetes & Endocrinology, 2024, Article e187.
[8]Schwarz, J.-M., et al. “Hepatic de Novo Lipogenesis in Subjects Consuming High-Carbohydrate Isoenergetic Diets.” American Journal of Clinical Nutrition, vol. 77, 2003, pp. 43–50.
[9]Brownlee, Michael. “The Pathobiology of Diabetic Complications: A Unifying Mechanism.” Diabetes, vol. 54, 2005, pp. 1615–25.
[10]Silventoinen, Kathryn, et al. “The Glycemic Index of Foods Influences Postprandial Insulin-Like Growth Factor-I.” American Journal of Clinical Nutrition, 2012.
[11]Saad, Randa K et al. “Abdominal Visceral Adipose Tissue and All-Cause Mortality: A Systematic Review.” Frontiers in endocrinology vol. 13 922931. 22 Aug. 2022.
