So a fun observation for the math nerds out there that I noticed today.
If you use the Mifflin-St Jeor equation for TDEE with a stress factor of 1.1 (sedentary) then it comes out that a 1lb change in weight = a 5 kcal/day shift in TDEE. This delta is independent of age, height, sex, and specific weight range.
So, as an example, if you add JUST 100 measly calories per day (average) to your lifestyle, the equation predicts that your weight will increase by 20 lbs in order to bring your expenditure back to balance.
If we compound the formula daily, you will have gained:
8.14 lbs by end of year 1
12.97 by end of year 2
15.84 by year 3
and so on at slower and slower rates, but you get to 19.5 end of year 7.
The same is true for say, an already sedentary person that goes on meds that lower their energy expenditure by 100 cal/day.
The point I wanted to make with this post is for all the people that look back and "can't understand how they could've gained all that weight" and who have family members that say the same. Time is a crazy thing and it only takes a tiny change in habits over a long period of time to make drastic changes. The same is also true of losing it! although we want it to move a bit faster! Hope everyone enjoys this and I have the spreadsheet if anyone want it.
PS the above is only true of a sedentary individual, more activity dampers the effect by increasing the magnitude of the TDEE change. Also we are not robots, the equation is a model, an estimate, remember that.
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