State-registered dietitian David Swain advises on one of the main areas of parents' concern, your children's diet and nutritional needs.

Pure orange juice is a valuable source of vitamin C but can you have too much of a good thing? Can it fruit juice cause mood-swings? Carbohydrate-free diets are popular with Hollywood superstars, but are they a safe method of weight loss? Read David's answers to find out!

• All Ages: Soup & Vitamins
• All Ages: Hyperactivity & Diet

• Orange Juice & Anger Levels
• Carbohydrate-Free Diets
• Teen Vegetarians At Xmas
• Would-Be Model's Diet
• NEW! Teen's Antacid Tablets