If you are thirsty during healthy weight loss, it is normal if there are no other adverse reactions and you can rehydrate in time. For people who exercise or diet, it is normal to be thirsty if they have reasonable rest and no other discomfort. This is because when you exercise and sweat a lot, the osmotic pressure in your body changes and your body is in a state of dehydration, so you can replenish water in time. Of course, there are other special circumstances, such as diabetes can also cause frequent thirst, and obese people are also at high risk of diabetes, so attention should be paid to timely check whether there is diabetes. If you feel thirsty after taking diet pills, you need to be alert. At present, domestic legal diet pills generally do not cause thirst, while some diuretics and laxatives are prone to cause thirst, so you should be alert to whether the drugs you are taking are legal. Drugs have certain side effects, and long-term use is likely to affect the endocrine and gastrointestinal functions, and it is more recommended to take a reasonably controlled diet with exercise to lose weight.