I have heard that if you are dieting to loose weight, once your body gets used to your diet, it adjusts itself to the calorie intake and you cannot burn anymore. [Your metabolism slows down]

for e.g. If i eat 2000 calories a day and i burn 2000 calories as well. Now if i reduce it to 1500 so it means that i am burning 500 calories extra,

How long does it take for my body metabolism to slow down to 1500 calories a day?
Same with workout as well, If i burn 2500 calories by a particular workout, how long will it take for my metabolism to slow down and reduce the calories i burnt?

It can take about 2 weeks or so before it’s back in full swing from fasting. During fast, in about 3 days, the body will live off fat reseves, then start catabolizing muscle tissue, but water is essential

Do it gradually. It should take around two months if you follow a strict diet of eating small meals every hour.

well i been on a diet for 9 days now. my calorie intake is 1000-1200 calories. i also was drinking 1 -2 gallons of water a day. i lost 12 pounds in 9 days, but i think it does cause rapid Weight loss but for only a short amount of time. but it also depends how active you are. if your are really active then your body is going to need more food to burn for energy. and since you would be eating 1000-1200 calorie like i was its going to use fat. but i suggest have a calorie intake that low take some vitamins as well. because your body wont be getting enough nutrients.

Unless you drastically restrict calories for a very long period of time, no permanent damage is done to your metabolism. I challenge anyone to dig up a study to prove otherwise.

That said, get a post-diet sluggish metabolism back on track while increasing calories, you should slowly add calories into your diet over the course of a few weeks, while INCREASING your exercise levels. Keep an eye on the scale and on your measurements.

The idea is to keep increasing calories while staying at the same weight. You will be increasing the rate of tissue turnover (read:metabolism) through all the exercise, while getting your body accustomed to a much higher food intake. After you have maxed out your exercise (6-8 hours a week), cut back on the exercise and your food intake just a bit, and then just monitor your progress to make sure you are not gaining or losing weight.

This is also a good strategy to use for a couple of weeks BEFORE going on a fat loss diet to get your metabolism really revved up before you reduce calories.

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