How diet pills work depends very much on the ingredients they contain. While some have an appetite suppressant effect, others will accelerate the metabolic rate or will eliminate toxins that promote weight gain. However, diet pills are preferred over herbs for weight loss because they contain extracts, have a higher concentration, and hence are more effective.
Appetite Suppressive Effect
Diet pills based on hoodia gordonii fall in this category, even though there is not much published evidence to sustain this. Keep in mind, though, that there are many other plants that are able to suppress the sensation of hunger. The active molecule found in the purified extract of hoodia gordonii is called P57, and as it is passed to the brain, it helps controlling the appetite. As a result, you will ingest less food, and thus reduce the calorie intake. Appetite suppressants, in general, work by increasing serotonin and catecholamine levels. These two chemicals control mood and appetite.
Metabolic Rate Accelerators
Some diet pills are meant to improve metabolism and to promote calorie burning. Exercising while taking such pills will help you to burn calories even faster.
Consulting a health care provider before taking such diet pills is mandatory, as they tend to increase blood pressure. If you have hypertension, you can try lowering the dosage or taking another type of dietary supplements.
Prevent Fat Absorption
Another role of diet pills is to block the absorption of dietary fat. The active ingredients of these pills inhibit the enzyme lipase in the gastrointestinal tract. As fat is no longer assimilated by the body, it will be eliminated in stool. However, these pills also affect the absorption of fat soluble vitamins. In order to avoid deficiencies, you are recommended to take vitamin supplements along with these diet pills. More than that, diet pills are not adequate to everybody who is over weight, and hence, you should take them only if you suffer from obesity.
Antioxidants and Weight Loss
Acai berry extract, a common ingredient found in many diet pills nowadays, is rich in antioxidants that fight free radicals and help your body to stay healthy. Antioxidants prevent cell oxidization and improve energy levels. The latter is particularly helpful if stress is the main cause of your weight gain. You also need to pay attention while taking diet pills based on antioxidants. Vitamins C, E, and A are all antioxidants, but need to be administered carefully. Vitamin C is water soluble and does not pose a threat to your health, but vitamins A and E are fat-soluble and lead to toxicity if taken in high amounts. More than that, it has been proven that these vitamins are particularly effective if they come from fruits and vegetables, rather than from dietary supplements.
Regardless of the type of diet pills that is used, you are advised not to take them for prolonged periods of time. In addition, you should rely on diet pills that are approved by FDA, as these do not contain hidden ingredients and do not have serious side effects. These pills need to be correlated with a healthy diet and regular exercise, in order to obtain optimal results.