Fat Free Mass (FFM)/Lean Body Mass (LBM) - how to use in calculations (TDEE / Macros

Hi all,

I’ve been reading up on the many posts and threads here in this forum as I’ve been getting back into a more conscious and healthy lifestyle. So far, so good; I’ve lost over 10 KG from January to July 2021. Some stats below:

- Age = 40 years (1981)
- Total body weight: 102 KG >> 90 KG
- Fat percentage (estimate): 30.1% >> 23.8%
- Fat Free Mass/Lean Body Mass: 68.6 KG

I’ve a question that's been puzzling me for a while now, and it seems that I’ve not been able to find a conclusive/uniform answer on this forum, or elsewhere. My question is the following:

In what way, when, do we use our Fat Free Mass (FFM) in calculations to determine our TDEE and macros for nutritions -- And, yes, keeping in mind that these are rough guestimates and that it's always better to use real-time data to monitor.

A few examples:

- When applying the Katch-McArdle formula, you need to use your Lean Body Mass/Fat Free Mass. But do you then also calculate the all nutritional value (macros and calories) also on the Lean Body Mass/Fat Free Mass?
- When applying the Harris Benedict Equation, you need to use your Actual Total Body Weight. But do you then also calculate the all nutritional value (macros and calories) also on your Actual Body Weight?
- Some suggestions I’ve come across calculate with the Expected Goal Weight

Thanks you.


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