Great things come in small packages'. This can be said for the diet pills too, which look tiny, but can do wonders! It can perform an entire range of activities that an individual might not be able to do on his own.

Diet pills are weight loss drugs that aid an individual in his quest to lose weight. If taken in addition to an exercise regime, and a low calorie diet, the results could be miraculous. These are essentially used for people with a body mass index (BMI) of 30 or more. However, if the person is suffering from high blood pressure, diabetes or high cholesterol that may cause heart problems, the medicine can be used for a person with BMI 27. Diet pills are prescription drugs that are relatively safe and the best bet for an obese person.

Diet pills come provide various functions - it is necessary to be aware of its actions when selecting from amongst the best pills available today.

1) Ability to boost metabolism: These are for people who suffer from a low body metabolic rate (BMR). The pills for this function have ingredients that enhance the body's metabolic rate. In other words, it helps the body to burn excess fat. The key ingredient present could be alpha lipoic acid, green tea extracts or 'L-Caritine' because all these have been proven effective in increasing body metabolic rate.

2) Appetite suppressant: Drugs can also effectively suppress appetite. This kind of medication works on the central nervous system thereby suppressing appetite. There is a reduced intake of the total food consumed, thus helping in weight loss. Phentermine diet pills fall in this category of diet pills. Meridia also has a similar action.

3) Caloric stopper: Certain diet drugs have the ingredient to stop the absorption of calories in the body. These substances are called 'phaseolus vulgaris'. This creates an enzyme that efficiently controls excess calories in the body. These enzymes are called 'alpha amylase'.

4) Metabolic enhancers: Some drugs have 'lipotropic elements' that eliminate fat from the body. It 'sweeps' or 'flushes' the fat out of the body. These are found in vitamin C, chitosan, alpha lipoic acid and green tea extracts.

5) Water retention: Some drugs have diuretics that avert the retention of water in the body during a weight loss regimen.

Thus in many ways, the diet pills process fat and reduce weight. Their impact justifies the idiom 'fat burning machines'.