1) Healthy lifestyle - It is when you try to stay healthy. For example, you always eat healthy food pr do exercises.
2) You should eat more vegetables and fruits. Also you should do more exercises.
3) Healthy diet - it's when you eat or drink only healthy food, like vegetables or fruits. And also you should drink water or other healthy drinks.
4) I will do more exercises, I will eat only healthy food. I will be more sporty and healthy.