Senior one should not be nervous about learning. He can take a walk after supper, run after evening self-study and change his diet.

Eat a good breakfast, or you won't get enough nutrition. You can add some fruit for lunch and have a full dinner. You can't have dinner. If you are really hungry, have some fruit. After a long time, your appetite will become smaller. But now your focus is on study, and losing weight is only a small part of life.