Hi
Quick fix is one of the example for unhealthy diet plan.
A quick fix diet means ,the diet involves a strict diet plans & having only particular kinds of foods which makes fast weight loss. It can be done only for short period but complication comes when you continously follows this diet .The health problems vary from different diet to diet or person to person.
Some of examples given below :
Diet pills/diet powders are having fast effect in weight loss but after leaving this for sometimes you will get many health probs like nausea,vomiting & sudden weight gain.
Only fruits & vegetables or soup , this will works great in the initially, but if you using this diet for longer period then you may loss of muscle strength , so you can rebound weight gain due to muscle loss. Some of other example quick fix diet plan are beach diet , Only non-veg diet or atkins diet plan , this has many health benefits like hair loss, skin pigmentation, liver damages ,kidney damage, regain of weight.