I know math shouldn't be that accurate, but!!!!

[TheJokerKing666]

Regarding the 1 lb fat = 3500 kcals, THIS DOESN'T MEAN AT ALL THAT if I spent 3500 kcals IN ADDITION TO MY BMR, I will ever burn 1 lb fat, since calorie expenditure won't be all from fats, right? I mean there's water and glycogen (in muscles and liver), in addition to carbs (glucose in the blood).

Now Considering the FBZ rule, which is purely statistical, maximum fat calories expenditure would be about 70-75% of the total calories, therefore to burn 3500 kcals of fats (corresponds to 1 lb), you have to burn =3500/0.75=4666.67 kcals, am I right?

[JSim83]

Regarding the 1 lb fat = 3500 kcals, THIS DOESN'T MEAN AT ALL THAT if I spent 3500 kcals IN ADDITION TO MY BMR, I will ever burn 1 lb fat, since calorie expenditure won't be all from fats, right? I mean there's water and glycogen (in muscles and liver), in addition to carbs (glucose in the blood).

Now Considering the FBZ rule, which is purely statistical, maximum fat calories expenditure would be about 70-75% of the total calories, therefore to burn 3500 kcals of fats (corresponds to 1 lb), you have to burn =3500/0.75=4666.67 kcals, am I right?

I don't understand why people focus on completely irrelevant things like this. Eat at deficit and you'll lose weight. Track your calories and weight and adjust the calories based on what you see on the scale. All you need to know is how to calculate your calories. That is all the math you need.

[nickym92]

I wouldn’t worry about the mah or anything. Best way to make sure you don’t lose muscle is to make sure you get enough protein in. Around 1g per pound of lbm. And keep your fat intakes to around .4xbodyweight. Keep those around that and hit the wieghts hard and stick to your calorie deficit. You can’t put an exact number on what proportion of what you’re going to lose, but you can follow those golden rules and watch the pounds drop and hope for the best.

[Serpentarius]

Regarding the 1 lb fat = 3500 kcals, THIS DOESN'T MEAN AT ALL THAT if I spent 3500 kcals IN ADDITION TO MY BMR, I will ever burn 1 lb fat, since calorie expenditure won't be all from fats, right? I mean there's water and glycogen (in muscles and liver), in addition to carbs (glucose in the blood).

Now Considering the FBZ rule, which is purely statistical, maximum fat calories expenditure would be about 70-75% of the total calories, therefore to burn 3500 kcals of fats (corresponds to 1 lb), you have to burn =3500/0.75=4666.67 kcals, am I right?

You are missing a key point, the amount of fat oxidation that occurs, toss that into the formula.