Are Alli Diet Pills Effective? The effectiveness of an Alli Diet Pill, of course, will vary person to person. Keep in mind that good nutrition and a healthy diet as organic as possible combined with an active lifestyle might be more helpful than a weight loss pill. However, realizing many people are very busy and prefer a sedentary lifestyle than an Alli Diet pill may be what they are looking for. It sure seems you would want to discuss taking weight loss pills with your nutritionist or doctor before taking them. A Doctor should be able to determine if these pills would be effective and safe for your body and what type of side effects to expect, if any. They would also want to cross check with the medicines you currently might be taking. You might be surprised and find out your nutritionist just wants you to become active and eat healthy rather than worrying about diet pills. Just things to think about regarding your weight loss concerns.