Many, many years ago, I studied Nutrition to A Level standard, and we were then taught that the human body needs the five following components for a healthy diet;
Protein...found in Meat, Fish, Eggs, Milk & Dairy products, Nuts and Pulses
Carbohydrate & Fibre....mainly found in vegetables and grains
Fat...a little fat is necessary in the diet for health
Vitamins....found in Fruit and Veg, essential for good health
Minerals....Found in Meat, Fish, Cereal, Dairy foods, nuts and vegetables
I don't know if they still teach these things at school, but a lot of people seem confused about what foods they should or shouldn't eat, and fail to realise that a broad range of food is what we thrive on, that way we don't miss out on any of the important elements that contribute to a healthy diet.
A calorie controlled diet is therefore good because we can still vary our foods whilst keeping track of the quantity to enable excess weight to be lost.
We were also taught that different people have different dietary needs; higher energy foods for children, more easily digested foods for the sick and higher calcium content food for elderly; we used to be given a task to plan a days menu for different people. Does this happen anymore?