Top 5 Reasons Losing Weight Quickly is Unhealthy

1. Too Much Change. Losing weight at a healthy rate (two pounds per week) requires a lot of change. You have to cut calories, increase you physical activity and get rid of some of the foods you love to eat. If you're starting a healthy weight loss plan, you spread this change out over a few weeks so you can build a solid foundation. When you try and lose weight at a pace quicker than two pounds per week and you don't want to build that foundation of slow change, you'll be trying to pack some very hard new habits into your life with no time to adjust. This will place heavy strain on your body and eventually forcing you to abandon your diet all together.

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2. Yo-Yo Dieting. Once you go back to your old habits, you'll gain all of the weight back plus a few pounds. This is called yo-yo dieting because your weight goes up and down with every abandoned attempt. Each time you fail another one of these diets, you'll gain more weight than you started with and find it more difficult to lose the same amount. Instead of constantly going up and down, get a long term solution to your weight problems so you won't have to quickly lose weight every time you need to look good.

3. Not Enough Food. If you're trying to lose weight faster than the healthy pace, you'll find yourself eating close to nothing. Losing two pounds per week (healthy weight loss rate) requires a 1,000 calorie per day deficit. If you want to lose four pounds per week, you'll ned to double your deficit to 2,000 calories per day. If your body burns 3,000 calories each day, you'll only be able to eat 1,000 calories to reach your weekly weight loss goal.

4. Nutrients. If you're still thinking about losing weight at an extremely fast rate, you'll be doing your body a lot of harm in the long run. Each day, you need to get a certain amount of nutrients from your diet. If you're on a normal and balanced diet, this isn't a big issue. When you start cutting calories, you're also giving your body less nutrients to work with. Less than the required amount of nutrients will negatively affect the way your body functions. While it's true you can supplement some of these nutrients, they aren't as effective as getting them from the foods you eat.

5. Energy. To lose weight at a fast pace, you'll need to do a lot of exercising. You'll also need to cut calories which will take away the energy you need to exercise. Without food you can't exercise a lot and without a lot of exercise, you can't lose weight quickly. This is another reason why these crash diets aren't sustainable.