How can a deficiency of Vitamin D or calcium lead to conditions like rickets or osteomalacia, and how does this affect bone mineralization?

What is phenylketonuria (PKU), what causes it, and how can it be treated?

How do some mammals produce ascorbic acid, while others require a dietary supply of it, and what is the significance of this difference?

What are the consequences of starvation, and how does it lead to the breakdown of body tissue?

What are the risks associated with being overweight, particularly in relation to hypertension and type II diabetes?

How is appetite controlled by the centre in the hypothalamus, and how does this affect eating behavior?

What are the causes and effects of malnutrition, and how can it result from deficiencies, imbalances, or excesses of nutrients in the diet?

How does the lack of essential amino acids affect protein production?

Which fatty acids and amino acids are considered essential, and what is their role in the body?

What role do vitamins play in the body, and why can’t they be synthesized by the body?