My Quora Answer to:
How much weight can you lose in a week with exercise?
It depends on a lot of factors.
First of all you have to understand that you can lose fat AND gain muscle without a change in weight. That too, depends on several things, including which exercise and how often. Both lifting weights and cardio will help you lose fat, but cardio causes muscle loss. That's why runners often look like stick figures.
And of course, what you eat and how much you eat are factors. A ketogenic diet causes rapid fat loss and eating low on the glycemic index typically means you can eat until full. The problem I found is that a strict ketogenic diet is difficult to sustain. Conversely, a diet rich in simple carbs and “ugly fats” will make it nearly impossible to lose fat, no matter how much you exercise.
Another major consideration is age. A decrease in insulin sensitivity occurs in almost all of us starting in our 30’s. Compare pictures of someone at 20 and 25. Usually not much different, eh? Now look at pictures of someone at 30 and 35. Interestingly, progressive resistance weight training increases insulin sensitivity at all ages. Other age-related factors include decreasing hormone levels and enzymatic activities.
Lastly, supplements also affect your ability to lose fat. But that's a whole nother Answer altogether.
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