Which of the following blood lipids is influenced more by physical activity than by nutrition modification?

LDL cholesterol is primarily reduced through dietary modifications - particularly decreasing saturated fat and dietary cholesterol intake - making nutrition the dominant intervention for this fraction.

HDL (high-density lipoprotein) is the blood lipid fraction most significantly elevated through regular aerobic physical activity. Unlike LDL, which responds more directly to reductions in dietary saturated fat and cholesterol, HDL levels are strongly correlated with exercise frequency and intensity. Regular moderate-to-vigorous aerobic activity is the most effective lifestyle intervention for increasing HDL concentration.

VLDL is most influenced by carbohydrate and triglyceride intake in the diet, and is not the lipid fraction most responsive to physical activity.

Total cholesterol is a composite measure heavily influenced by the LDL component, which means dietary modification has a high impact on this value.