Get calories from nutritional information [closed]

Question

I'm eating a pack of biscuits and on the label the following information is given:

Nutritional information per 100g of product

Carbohydrates - 75g
Proteins - 6g
Fat - 15g
Cholesterol - 0mg
Energy - 468kcal
Calcium - 60mg
Iron - 8mg

I would like to know more about this information. What does the information in grams mean? Should I be only concerned about the calories? How can I get the calorie information?

Answer 1

You have to keep in mind the following:

• 1 gram of fat yields 9 calories
• 1 gram of carbohydrate yields 4 calories
• 1 gram of protein yields 4 calories

so for the food you are eating:

Carbohydrates - 75g  ==>75*4 = 300 cal
Proteins - 6g ==>6*4 = 24 cal
Fat - 15g ==>15*9 = 135 cal

==>Carb+protein+fat gives total calories = 300+24+135 = 459 cal 

as for the vitamin/minerals:

Cholesterol - 0mg
Calcium - 60mg
Iron - 8mg

Those are not related to calories.
In general, nutrition labels should have a percentage daily value on the right side, which for these vitamins tells you how much percent of the required daily value that you need, does your food contain.

The vitamin/mineral daily requirements depend on your age and gender and is about how much (grams,mg,mcg.etc..) of each is required per day. You can check Health CANADA's website, they have a lot of info.