When you lose weight, what do you lose first: water ,fat, muscle?
And what helps you to lose this f..... fat?
It depends on many factors.
If you drastically reduce your calories and carbs intake, without lifting weight, you will definitely lose weight, but much of the initial weight loss will be muscle and water.
Suppose you drop 5-7 lbs in your first week on a low calorie/carb diet:
sounds impressive, but if one pound is fat, 2-3 pounds are
water and 2-3 pounds are muscle, what did you accomplish?
I have said this before, and I will say it again : your goal should never be weight loss. Your goal should be fat loss.
Most people will lose fat simply by adding a regular exercise
routine (cardio and weight training) to their schedule and by "cleaning up" their diets.
By "cleaning up" your diet, I mean that you've mastered all
the nutritional basics like eating small frequent meals, eating lean protein with veggies in every meal, controlling portion sizes, cutting down on unhealthy fats and adding healthy fats, avoiding sugar and refined foods, etc.
Just remember, a combination of good nutrition, cardio and weight training will help you lose the fat and maintain the muscle.
Reducing calories drastically for a long period without weight training will not help you lose fat. Why ?
When fewer calories are consumed, the body compensates by reducing many of the hormones involved with thyroid function/metabolic rate (T3/T4, leptin, etc.) and increasing production of an enzyme called lipoprotein lipase, which conserves food energy by storing calories as fat.
In simple terms, when you restrict calories too low your body doesn't necessarily know when your next meal is coming (your bodies goes into Starvation Mode) , so it'll take what little calories it is getting and store them as fat for later use.
Unfortunately, metabolic rate is in direct correlation with how much lean body mass (LBM) you have, and given the fact that long duration, low-calorie diets can result in substantial muscle loss — sometimes as much as 45% of total weight loss, you can see how this approach is counterproductive.
Initially the majority of people who restrict calories will make some decent progress for a few weeks as far as weight loss is concerned. However, there will come a point when progress stalls and no matter how much they lower calories or how much they increase their caloric expenditure through exercise — that little bit of fat on the abdominals or inner thighs will just not go away.
Why?
Fat cells have both B1 (beta 1) and A2 (alpha 2) adrenoreceptors (specific to the catecholamines adrenaline and noreadrenaline). B1 receptors send good messages and can be viewed as the "good guys". They activate lipase, which causes the fat cell to break down from a triglyceride to a free fatty acid (which is then transported via albumin to be burned off and used as energy).
Noreadrenaline is a stress hormone and is what is used to "light up" the B1 receptors.
For example, when someone drastically reduces calories (initially) or engages in high intensity exercise (a stress to the body), noreadrenaline is released, and it seeks out B1 receptors to break down fat.
A2 adrenoreceptors, on the other hand, are the "bad guys," and are the dominant receptors in stubborn body fat. They block lipase in the fat cell, which promotes additional triglyceride formation. They also decrease the generation of noreadrenaline, which results in decreased activity with the B1 receptors, which is not that big of an issue because lower body fat doesn't have many B1 receptors in the first place.
And while I'm sure I lost many of you while you were reading the last few paragraphs, I do have a point. Low calorie diets cause an INCREASE in the number of A2 receptors in the body.