Diet pills have been proven to be ineffective in most studies. Everyone has a different BMR. So some people have to eat less and exercise more while others can't gain weight.... Science!
Actually I wanted to test these things out so I got 1 brand and I asked her not to changed anything about her life no exercise nor any dietary change. She lost 6 pounds in 2 weeks, so I'd say they do have an effect
Okay, if you read the studies on diet pills and the active ingredients, the ones that tend to be effective have stimulants. There are two problems with them. 1. They have side effects like high blood pressure, trouble sleeping, irritability. 2. You have to stay on them to keep the weight off. Studies have shown that the majority of users regain the weight within a year.
The other dietary pills shown to be effective are the ones that give you a full feeling. It is like low cost gastric by pass. Depending on what you take, the side effects tend to be minor. However, those who eat food with higher fat content tend not to lose weight. This doesn't limit calories, just mass. It's effective up to certain point
There are also pills that "block fat intake" These tend to have nasty digestive side effects and and only work so long as you are taking them. People tend to put the weight back on quickly after they stop taking them
Better?
Just adding some of my own knowledge into the mix. From my experience training and dieting for several years. 1.) Diet pills never work, in the long term at least. They mess with your hormones so as soon as your off the pill you gain mass again. 2.) Suddenly reducing the amount you eat doesnt make it you lose weight either. You have to reduce your daily intake in 100-200 calorie increments to lose weight or else your body will just suddenly try to adapt and mess up your hormones to sustain your weight. 3.) Diet and exercise go together you wont see real fitness results unless you get off you fat ass and move. Thats all there is to losing weight. Its as simple as that. Effort and dedication. Enjoy fatass tumbleristas
Better?
Stop being paranoid about your weight