Q: What exactly are fat calories and what is its relationship with weight reduction? I do exercise on an Elliptical Trainer and its meter gives fat calories as well as total calories burnt. I understood earlier that every 9 calories burnt reduce the weight by a gram but a relationship for fat calories is not known to me. Can you explain in detail please?

A:Fat calories refer to the calories that you get from fats. You get calories from carbohydrates and proteins as well. One gram of carbohydrate and 1g of protein yield 4 Kcal each whereas 1g of fat yields 9 Kcal. Carbohydrates are stored in our body as glycogen. When the glycogen and protein stores of body are saturated, carbohydrates and proteins start getting converted into fats and are stored in adipose tissues. As mentioned above 1g of fat yields 9 Kcal and thus when 9 calories are burnt, the weight reduces by 1g.