HoldsUp

Valter Longo

University of Southern California

Valter Longo is the director of the Longevity Institute at the University of Southern California and the Oncology and Longevity Program at the Institute of Molecular Oncology Foundation in Milan, Italy. His research focuses on the biological mechanisms governing the aging process and the roles of diet, caloric restriction, and fasting in human healthspan. His publications explore the therapeutic and metabolic impacts of fasting-mimicking diets across various conditions, including cancer, type 2 diabetes, and cardiometabolic diseases.

27 claims checked on air: 2 context 1 contradicted 21 supported 3 unverified 1 flagged

What they said on air - contradicted

12 citing their own research

0:46:42contradictedhighHow diet and lifestyle regulate longevity with Dr. Valter Lo

Complete digestion and absorption of ingested food calories takes approximately 30 hours from the time food is eaten.

"I mean, all the digestion takes, you know, 30 hours to complete the food digestion, right? And in the from the time you eat to the time that all the calories have been taken up, it takes probably over a day." (said at 0:46:42)

The speaker confuses total whole-gut transit time with the time required for caloric digestion and absorption. The vast majority of macronutrient digestion and caloric absorption occurs in the stomach and small intestine, taking roughly 4 to 8 hours in healthy individuals (gastric emptying typically takes 2–5 hours and small bowel transit takes 2–6 hours). The remaining time (10 to 60+ hours) occurs in the large intestine/colon, which primarily absorbs water and electrolytes and forms stool, not digesting or absorbing dietary calories.

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