For a balanced diet you need 7 nutrients in the right proportions.
Carbohydrates and fats for energy
Protein for growth and repair
Vitamins and minerals to avoid deficiencies of them
Roughage or fibre to avoid constipation
And water for transporting things around your body in
A way of remembering this is: Can Fat People Vault My Round Wife?
A measure of how healthy you are is the BMI index; this is mass in kilograms divided by height in metres, squared.
Anywhere between 20 and 25 is perfect less than 20 is underweight, between 25 and 30, you need to be careful, and above 30…