Challenge the way you eat

Consume your calories and nutrient intake randomly.
Instead of following a diet, challenge your body to go Mondays and Wednesdays without protein, for example. Intermittently (and only intermittently) depriving our body of certain food has been shown to bring beneficial effects on energy levels.

Fast on Tuesdays and Thursdays and eat whatever you like on Friday, Saturday, and Sunday.
Fasting is a simple way of challenging your body. It causes a better psychological response because deprivation as a stressor activates some pathways that facilitate the subsequent absorption of the nutrients.

Change the schedule the following week.
This way, you will teach your body that each small challenge is a raw material for greater achievement, and thereby improve your health.