Yes it's a simplification, but only because it doesn't account for a 'modern' diet.
A proper balanced diet and it works. The trouble is, and why nutritionists and the like are needed, because anything is available all year round in such quantity (and low quality) people just don't understand by themselves.
A proper balanced diet and it works. The trouble is, and why nutritionists and the like are needed, because anything is available all year round in such quantity (and low quality) people just don't understand by themselves.