It's tangential because, despite being at best an approximation, calories in is still a measure that can be used to reduce intake. It might take experimentatio

It's tangential because, despite being at best an approximation, calories in is still a measure that can be used to reduce intake. It might take experimentation to find the limits for you. It's quite simple: if you are gaining weight, eat less. The variation between calories marked and calories absorbed is not great enough to fundamentally matter.