Здравствуйте. Правильно ли я составила текст с грамматической точки зрения? - вопрос №1054385

Здравствуйте, Галина!

All we probably know that vitamins are a necessary part of food. They often say: «This food is useful, it has a lot of vitamins.» But very few people know exactly what are vitamins, where they come from, what foods have real benefit for our health. Vitamins are the organic compounds which are necessary for the person for good health. Its lack in the diet develops a certain often repeated disease or broken health in general. Our food have to be correctly balanced. We should eat fruit and vegetables and have to take products containing proteins, fats and carbohydrates. Vitamins shouldn't be substituted with synthetic vitamins from a drugstore. Oranges and black currant, containing vitamin C, fish and caviar are extremely useful — vitamin B, E. It`s necessary not to kill vitamins when cooking.

Спасибо за Ваш вопрос :)