I'm currently developing a (personal and non-profit) web app where I store and make stats from nutrition and activity data. In this app I enter every single meal I eat or physical activity I do in order to follow a "global health score".

To complete some of the graphs, I need to know how much proteins, carbohydrates and fat are lost (consumed) due to body activity.

Despite searching on the internet I didn't find any resource. Are there papers or tables I can use to compute those stats?

  • We don't "lose" proteins, carbohydrates, and fat. We eat them and convert them to other materials (and energy). You're probably thinking of caloric expenditure?
    – Alec
    Aug 8, 2020 at 23:32
  • @Alec "lose" may not be the good word, I should have said "consumed". If I understand what both of you are saying, we can know the amount of calories lost due to an activity, but it's hard (impossible) to know how fat, carbs and proteins are consumed by the body ?
    – dooxe
    Aug 9, 2020 at 6:32
  • You need to expand your understanding of the process. ATP is what the cell uses for energy The body uses glucose to create more ATP. The stored form of glucose is glycogen. All the body's digestive processes exist to convert fats, protein and carbs to glycogen. And, some people are more efficient at this, some are worse, etc. What you're asking is not really quantifiable in an app, I don't think. As @POD and Alec say, it's extraordinarily complex.
    – JohnP
    Aug 10, 2020 at 14:55
  • @JohnP Your comment reads as if the body was able to synthesise glycogen out of proteins. There is no process I am aware of that is capable of doing so. Maybe you'd be able to elaborate? Apr 16 at 10:01


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