What will happen if a person stops eating for 5 days and only live on water and diet pills?

Diet pills: This is dangerous and may bring on a tragic event. The effect of diet pills depends on the pill, but all can be deadly. Diet pills are usually very bad for you. Talk to your family about seeing your doctor for an examination as to why you are gaining weight and then get proper treatment.

Hard to say: Starving the body long term can have adverse effects such as dehydration, electrolyte imbalance, hypoglycemia, weakness, fatigue, headaches, dizziness, syncopal episodes to name a few.Diet pills could excentuate these effects and cause tachycardia and blood pressure problems. Restarting a diet after starving also leads to rapid weight gain.Won't die for 5 days but probably won't feel great either.