What should someone do to prevent regaining lost weight?

a. avoid weighing himself or herself on a scale more than once a month
b. monitor daily energy nutrient proportions
c. avoid weight-loss support programs such as "weight watchers"
d. exercise regularly
e. adopt a yo-yo diet

Explanation:

Monitor nutrients included in our diets is crucial to weight control, because we would realise if we are getting enough nutrients, and also we would realise if we are eating to many carbs or fats.

Additionally, exercising reguarly we prevent gaining lost weight because it mantains out body fit, it helps to burn the excess of fat we could've eat.

Therefore, exercise regularly and monitor daily nutrientes proportions are ways to prevent gaining lost weight.