Robert Lustig explains why visceral and liver fat matter more than weight, and shares two biomarkers to track metabolic health: waist circumference and fasting insulin. Fasting insulin under 5 µIU/mL is optimal, under 10 is acceptable, and 15 or higher signals a problem.
Questions this video answers
Less than 5 (µIU/mL)
Less than 10 (µIU/mL)
15 or greater (µIU/mL)
Chapters
It's not the fat you can see that matters, it's the fat you can't. If you can't see it, how can you know it's there? That's the question you're asking. What are the biomarkers? There are a couple. The cheap one, the sensitive but not specific one, is free. It's your waist circumference. If you have an increased waist circumference, the chances are the reason for the increased waist circumference is visceral fat and possibly liver fat as well. The problem, of course, is standards. And the standards are different for men and women, and the standards are different based on age, and the standards are different based on race. So it gets hard to know who you're standardizing against. How about lab tests? Fasting insulin is the cheapest, easiest lab test to determine whether you have a metabolic problem. Your fasting insulin should be less than 10, and optimally, it should be less than 5. If your fasting insulin is 15 or greater, you've got a problem. Just that simple.