Answer:
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100% true. Unhealthy food has fat calories which cause weight gain. If the diet is a healthy one with no fat calories, you will not gain fat. Exercise is also key as it burns calories and reduces chances of various diseases that come with being overweight.
In the morning so that you would start the day off well and be more awake and energetic
Eat Healthy food (avoid fatty, unhealthy foods)
Exercise, Mostly Cardio (Running, Walking, Jogging)
Limit meals to snacking 4-6 times a day, not eating huge portions all at once, like normal.
Do not over-eat, stay within your boundaries of how many calories your body needs per day
Stay positive: Having a positive attitude for all of the other steps is honestly a huge key, and staying committed to a plan that you have set.