- Calories from the foods we eat
- Stored glycogen in our liver and muscles
Our body prefers glycogen while we exercise and a mix of the food we eat and body-fat at other times. While we rest our body uses the highest percentage of body-fat when we have a calorie deficit.
This post is about being effective, and I think effective means long term results. Yes, if you only ate 800 calories and exercised for several hours a day you would lose a lot of weight in the short-term, but it would haunt you in the end when your metabolism shuts down on you. It is best to do it gradually.
The math is very simple, 3,500 calories is equal to one pound of body-fat. So if you want to lose one pound a week you need a daily deficit average of 500, and for two pounds an average deficit of 1,000.
You can get this deficit by simply eating less or just by increasing exercise. The fact is our body just sees the net of our calories in versus our calories out so you can do it anyway you like, but yet again effective long-term results come from a combination of diet and exercise.
If your goal is to lose two pounds a week, then daily in some sort of combination of diet and exercise you need to have a net of -1,000 calories.
This again is why it is so important to log your calories. If you simply guess how much you ate, you are setting yourself up for heartbreak and failure.