The big players, calorically speaking, are fats and sugars.

从卡路里的角度来说，最大的能量玩家是脂肪和糖。

Dietary fat is also the most calorically dense macronutrient, clocking in at 9 calories per gram compared to 4 per gram for either carbs and protein.

膳食脂肪还是含最多卡路里的营养物质，其每克约含9卡路里能量，多于每克4卡路里的碳水化合物或蛋白质。