Consuming a sugar-free protein smoothie is the ideal beverage to better withstand intense summer heat while maintaining energy levels.

noli's read

The idea of consuming a fresh, sugar-free smoothie is excellent for hydration without experiencing blood sugar-related energy crashes. However, the claim that protein helps overcome heat is physiologically paradoxical. A review of research on thermogenesis published by Klaas Westerterp in Nutrition & Metabolism (type of evidence: synthesis of metabolic studies) demonstrates that protein has the highest thermic effect of all nutrients, converting 20 to 30% of its calories into body heat during digestion. Therefore, consuming protein slightly increases internal body temperature, which may heighten the sensation of heat. Nevertheless, the liquid and iced smoothie format remains a highly digestible and refreshing option for maintaining intake when appetite decreases in the summer. This drink is therefore ideal for a sugar-free challenge, but its metabolic effect warms the body rather than cooling it.

the sources

No named source held this one up — that absence is part of the verdict.