Нужно написать сочинение по английски 1) Что такое витамины ? 2) Зачем они нужны людям ? 3) Что нужно есть людям , чтобы быть здоровыми ?

Отвечу только на 3)
Bread and grains
A balanced diet is based on bread and grains (food like rice and cereal). These food give fibre , iron and vitamin B. At least 40% of what you eat every day should be types of food in this category.
Fruit and vegetables
You should eat plenty of vegetables and fruit every day to make sure you get enough potassium and vitamins A,C and E.
Dairy products
Types of food in this category , like milk and cheese , have a lot of calcium and vitamin D.
These two elements protect you bones. You should consume milk, cheese or yoghurt every day.
Meat, fish and beans
This category also includes eggs and nuts. This types of food give you iron, magnesium and protein . White meat , such as chicken , is better for you than fatty, red meat.
Eat wisely.If you eat a balanced diet, you will feel great , look great, and always be healthy!