During a 2-hour walk in 40°C heat, physically active young men burn fat at a higher rate than young women, with a measurable difference of 0.34 grams per minute at the 30-minute mark, even though both groups show similar levels of fat breakdown in abdominal tissue and similar blood markers of fat metabolism.

When exercising in hot conditions, men and women release fat from the abdominal fat layer at similar rates, as measured by glycerol levels in the tissue, even though men burn more fat overall during exercise. This suggests that the difference in overall fat burning between sexes comes from other sources, not this particular fat depot.

During prolonged exercise in hot conditions, women show greater blood flow to fat tissue under the skin of the abdomen than men, even though the breakdown of fat is similar between sexes, indicating that blood delivery to fat may be regulated differently by sex during heat stress.

If a fit guy burns more carbs during a tough workout, he's likely to burn more fat afterward while recovering.

During exercise in hot conditions, males produce 94 watts more metabolic heat than females, even when accounting for differences in body size.