Diet pills are not worth their cost in terms money and health risks. Walk down the aisle of your local supplement shop and you'll see all kinds of products claiming to burn fat, lower your appetite, block calorie absorption and help you lose weight faster.
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The biggest problem with these diet products is that they aren't regulated. They don't have to be tested or approved by anyone. They make a lot of claims and are usually not backed up by independent studies.
The claims that are made are usually backed up by studies run by the companies selling the product. This isn't reliable science. You can pretty much make any study fit your needs if you're paying for it.
Even assuming they do work, it isn't a good idea to take them. Healthy weight loss is 1-2 pounds per week. If you lose weight at a faster rate, you are risking your diet and even your health. Even most product labels state that you shouldn't use the diet aid forever, so the question is: what happens when you stop? If the product worked like it promised, you will just gain the weight right back.