Gut health and weight loss: the science behind why some men struggle to lean out
Dr. Susan Carter, MD: Endocrinologist & Longevity Expert
Jan 09, 2026 · 10 min read
Calories still matter, but your gut microbiome can change how your body handles food, hunger, and metabolic “efficiency.” Here’s what the evidence says and what to do next if your weight loss feels harder than it should. Expert reviewed by Dr. Susan Carter, MD “When a man’s gut microbiome loses diversity, it’s like an ecosystem ...