My son is 2.5 year old and i want him to be smart andhealthy. which is the best food for him at this stage to make him physically and mentally strong?

Lucky boy! : I should probably refer you to my daughters, because they, like you, are much more attentive to their sons' diets than i was to theirs. However, i did teach, "eat when you're hungry; stop when you're full." introduce a variety of legumes (peas) & other vegetables early & model good food choices yourself at sit-down family meals. Avoid "fast"& pre-packaged foods, random snacking & sugary drinks.

Veggies! Whole foods: Make sure that he is getting 5-8 servings of a variety of vegetables daily. Avoid sugar and processed food as much as possible! whole foods such as sweet potatoes and brown rice are great sources of energy . Several servings per day of season fruits make healthy snacks and desserts!

Healthy variety!: It's interesting, but many toddlers will self-select a healthy variety of foods if offered a range of different foods. Toddlers need lots of nutrients - including good sources of protein - to help their brains and bodies grow. Eggs, chicken, cheese are good examples. Think of foods they can control - like vegetables dipped in hummus, or fruits with yogurt dips. Forcing toddlers doesn't work well!