The SECRET To Burning BODY FAT Explained! | Shawn Stevenson & Lewis Howes

4 Dec 2020 · 17 min
16:31

In this episode of The School of Greatness, host Lewis Howes interviews nutrition expert Shawn Stevenson about why belly fat persists and how to truly burn it. The conversation begins with a personal anecdote about training and quickly shifts to a deep dive into the biology of body fat. Stevenson explains that fat is an organ composed of several distinct “communities”: subcutaneous fat (the pinchable layer under the skin), visceral fat (the dangerous depot around internal organs), intramuscular fat (marbling within muscle), and the metabolically active brown adipose tissue that is rich in mitochondria. He describes how these fat types store energy, produce hormones, and communicate with the brain, pancreas, and other organs. Two key enzymes—lipoprotein lipase (which loads triglycerides into fat cells) and hormone‑sensitive lipase (which releases them)—are regulated mainly by insulin (promotes storage) and glucagon (promotes release). Excessive sugar and refined carbohydrate intake chronically spikes insulin, leading to insulin resistance and increased visceral fat. Stevenson highlights that when fat is oxidized, about 84 % of the mass leaves the body as carbon dioxide exhaled through the lungs, with the remainder expelled via sweat, urine, and other fluids. The discussion also touches on epigenetics—how food can influence gene expression beyond DNA—and the broader impact of diet on cognition, empathy, and overall health span. Throughout, the tone remains conversational, enthusiastic, and instructional, aiming to give listeners actionable insight into how food truly controls metabolism and body composition.

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