How do you caclulate how many grams of fat in one serving?

Answer 1

Calories are really a measure of heat.

You may recall from high-school Biology that plants use light energy in the process of photosynthesis to produce carbohydrates, fats and proteins. Thus, food contains energy which is released and converted to other forms of energy when the chemical bonds between molecules are broken.

Typically, to measure the energy content of food, a method called 'direct calorimetry' is used.

The food, normally about 1 gram of it, is placed in a sealed chamber called a 'Bomb calorimeter' that has water surrounding it. The piece of food is then burned (oxidized) by an electrical current. As the food burns, the water temperature rises due to the heat. This rise in water temperature reflects the energy content of the food.

Not all fats in our diet has the same energy content. Some fatty acids have about 8.6 kcals/g whereas some longer chain fatty acids may have 9.6 kcal/g.

However, for the sake of simplicity, we generally say that 1 gram of fat contains 9 calories (carbohydrates and protein contain 4 calories).

Therefore, if the food you are wondering about says it contains 8 grams of fat for example, then you know it represents about 72 calories of energy, i.e.,

8g x 9kcal/g = 72 kcal

If it has 14 grams of fat, then it contains 126 calories (14 x 9 = 126), and so on...

Scribbles222

Ok you could read all that. Or you could just multiply the number of grams you have by 9. All fats, multiplied by 9 gives you that amount in calories. However, if you want to find the amount of calories in one gram of protein of carbohydrates then multiply grams by 4.

Answer 2

The nutrition label should tell you how many grams of fat are in one serving. Look under "total fat" which is listed in grams. Then you can look at how big a serving size is to see if that is what you are actually eating.

Answer 3

you have to figure it off of the food label of whatever you are eating........ Meaning if the food label says 2 servings per package you have to double the fat grams. They are only listing calories and fat and all the nutrition items by the serving size. You have to pay attention to serving sizes

Answer 4

Not many people are smart enough to know exactly how much fat is in their food, but you can tell by how heavy (not weight) the food is. Like it's obvious that cupcakes will have a large amount of fat, but the apple slices will have a low amount of fat.

Answer 5

You can't unless you know what the grams are. Grams are a weight measurement but Calories are an energy measurement.

Answer 6

divide it by 9

1gm fat = 9 calories