Obesity can be controlled by following the below lifestyle changes-
Consuming less processed and sugary foods.
Including more fibrous foods (like fruits) in the diet.
Engaging in regular aerobic activities/exercises.
Reducing sedentary activities such as watching TV or any other screen times.
By improving sleep.
By reducing stress, since stress plays an important role in hindering with one's health and causing side-effects such as obesity etc. if ignored for a long period.