Question

weight - loss plans that are popular for only a short time *
binge eating
fasting
liquid diets
diet pills
fad diets
a desire, rather than a need, to eat. *
environment
hunger
emotion
appestat
appetite

Explanation:

Fad diets are weight - loss plans that gain popularity for a short time. Appetite is a desire to eat rather than a physiological need. Hunger is a need for food due to physiological cues. Emotion can influence eating but is not the definition of a desire to eat. Appestat is not the correct term here. Environment affects eating but doesn't define the desire to eat.

Answer:

1. Fad Diets
2. Appetite