Quote · Huberman Lab
Essentials: Tools for Hormone Optimization in Males | Dr. Kyle Gillett
Where this was said
Diet & Hormone Health, Diary, Vitamin D, Fiber
At 4:45 · chapter starts 2:17
Dr. Gillett walks through the dietary pillars that support healthy hormone development, starting with the often-overlooked role of dairy in raising IGF-1, which drives genital development, bone growth, hair, and skin during puberty. He explains that vitamin D functions as a sterol hormone in its own right, supporting testosterone production and bone mineralization up to around age 25. The gut microbiome gets a vivid treatment: Gillett describes it as an aquarium where dietary fiber acts as fish food, permanently shaping the microbiome set-point during the teen and 20s years. Most strikingly, he calls pure vegan or carnivore diets during early development 'a horrible idea,' warning that they are likely to significantly decrease free androgens by depriving the body of the varied inputs needed to sustain testosterone production. A mixed diet of quality animal and plant proteins, fruits, vegetables, and starches is, on balance, the optimal approach.
Pure vegan or carnivore diets during the teen years and early 20s significantly decrease free androgens. Dairy supports IGF-1, vitamin D supports testosterone, and fiber shapes the gut microbiome set-point for life — all of which matter enormously for hormone health during development.
Dr. Gillett warns that a pure carnivore or vegan diet in early 20s and teens is likely to significantly decrease free androgens.
Caloric restriction only boosts testosterone if you have excess body fat to lose. For lean individuals, a caloric deficit reduces hormone building blocks, increases catabolism, blunts GH and IGF-1 signaling, and raises SHBG — all of which suppress free androgens.
