Here are the correct answers:

13. You should have small frequent meals ___ drink more water too.
- D. and

14. Everyone needs ___ amounts of energy per day depending on age, size and activity.
- B. different

15. To lose weight, eat ___ calories than your body burns each day.
- C. fewer

16. Lack of vitamin E can cause skin diseases and ___.
- D. tiredness

17. Obesity can ___ the risk of heart disease and diabetes.
- A. increase

18. My aunt is a(n) ___ . She doesn’t have a habit of eating meat.
- D. vegetarian

19. It’s advisable that you ___ eat more small meals instead of three big meals in a day.
- A. should

20. ___ people do gardening regularly and grow their own fruit and vegetables.
- C. Healthy