If you maintain your body weight on 3000 calories. You then lower your caloric intake to 2600 calories. That equals a 400 calorie deficit. Whether you eat more carbs or not, the fact is you have a 400 calorie deficit. Add in exercise and you will loose weight.
Sure. I just said that but let's take your example, 3000 calories minus 400. If I eat 2600 calories of fat and carbs will I lose fat or gain it, stay the same?
Lose it, right? No as I'll be losing muscle and long term would gain fat.
Let's take 2 different "3000 calories".
Diet 1: 50% protein, 40 carbs, 10% fat - Mr Bodybuilder
Diet 2: 20% protein, 50% carbs, 30% fat. Mr Average
Which is most fattening?
I'll give you a clue, look up the word thermogenesis. In terms of calories USED as nutrition we get this:
Diet 1: Protein at 50% of 3000 - 1500. Now take away the 25% or so used just to digest it and we get 1125. The carbs are 40%, so 1200, carbs use up to 10% of the calorific value in digestion, so that's 1080. Fat is only about 4%, so 300 cals minus 4%, 288.
1125+
1080+
288
......
2493
Diet 2, Mr Average, still 3000 calories.
Protein at 20%, 600, minus thermo, 450
Carbs at 50%, 1500 - 10%, 1350
Fat at 30%, 900, minus 4% thermo, 864
450+
1350+
864
......
2664
Yeah I'm splitting hairs, that's only a difference of 171 calories.
Tell me, if you have a calorie deficit of 170 every day for a month, what happens?
170 x 28 = 4760 calories, or in 6 pack terms, 1.36lb of flab.
But a calorie is a calorie and who cares about nearly one and half pound of flab every month?
Don't get me wrong, if you noticed you were gaining flab you'd just do 25 instead of 20 mins cardio or something, my point is simply that nutrition is worth looking at a bit closer than just saying a calorie is a calorie.
Not all calories are equal all the time. As for "add exercise", that would reduce the available calories anyway, even if you stayed at 3,000
Anyway, whatever, 2 bakes spuds in oil late at night is not so good, that's all I wanted to say really.
B.