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Does 1 gram of fat have exactly 9Kcal?

Everyone always says “fat has 9 Cal per gram, carbohydrates and proteine have 4” but is it exactly 9 and 4? If for example you have eaten in a day 60 grams of fat, 190 of CHs and 140 of proteine is it okay to say that’s 1860Kcal? Thanks!

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Answer

I just caved and bought a used bomb calorimeter a while back.

I was definitely affected by disordered thinking about food, so I’d never recommend that to anyone. But I will tell you that labels are often so hilariously wrong that you might as well not worry about it at all. Some are lower, some higher. And I did a lot of work to operate the thing properly. In the end everything is such an approximation but it usually balances out if you’re eating a variety of foods. You just have to track your average weight and adjust accordingly I think, there’s no way to be 100,% accurate.

Answer

Yes, 1 gram of dietary fat yields roughly 9 cal when metabolized by the body. And, 1 gram of carbohydrate and protein has 4 cal each. Though the real value can be slightly different from this, but you can take it as the accurate value to calculate the calorie of the consumed food.

Answer

Guesstimates work fine when the numeric precision exceeds actual measurement precision.

Large margins of error (±20%) on label numbers allow for natural product variation.

BTW Your may be better off tracking servings of food groups instead of macros and micros.

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Canada Food and Nutrition

Canada Food Guide

Canada Nutrition Science and Research

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