In this lecture from the MetFix Foundations course, Matthew Sherburne explains how modern industrialized foods shifted diets toward highly processed, calorie-dense products that disrupt metabolic health. He contrasts this with a whole-food approach centered on meat, vegetables, nuts, seeds, some starch, little fruit, and no sugar or seed oils. Natural foods contain balanced macronutrients and micronutrients that work together through nutrient synergy to support energy production. Because cellular energy is generated primarily in the mitochondria through ATP production, dietary strategy ultimately becomes a question of how to best “feed” these cellular engines. Sherburne reviews several dietary frameworks—including Zone, Paleo, ketogenic, and carnivore—but emphasizes that many effective strategies converge on the same basic pattern: a diet high in fat, moderate in protein, and low in carbohydrate. This macronutrient balance promotes satiety, supports muscle repair, stabilizes insulin, and encourages fat oxidation and mitochondrial adaptation. The practical takeaway is: prioritize whole, natural foods that support metabolic health and energy production, then tailor dietary strategies to the individual’s current condition, goals, and pace of change.

The course took place August 23–24, 2025, in Southborough, MA.