3. What is it? Traced back as far as the 1930s Also known as the Hollywood Diet It was featured in the 1933 film “Hard to Handle”. Grapefruit farmer Lefty Merril begins diet craze calling it “The 18 Day Grapefruit Diet”

4. What is it cont’d The diet returned numerous times after the 30s Had a big outbreak of popularity in the 70s when it was known as the Mayo Clinic Diet even though it had nothing to do with the actual Mayo Clinic This version said you could lose up to 3 stones (about 42 pounds or 19kg) in 12 weeks

5. What is it cont’d Today it is generally said you lose 10 pounds (4.5kg) in 10 days Other versions say you do the diet for 10- 12 days and rest 2 days and then repeat the cycle again.

7. How is it done? There are numerous variations of the diet Most involve having half a grapefruit or a glass of grapefruit juice before a meal Most versions consist of cutting back on sugars and carbohydrates

8. How is it done cont’d

9. Dieters are to eat lots of foods that are high in protein, fat, or cholesterol. i.e. meat, eggs, etc Most versions of the diet requires cutting down calorie intake to 800 cal per day. Dieters are to fast between meals, eat until fully satisfied during meals, and avoid exercise due to the low-calorie intake.

10. How is it done cont’d The basic menu plan is the same for each day of the week: Breakfast: 1/2 grapefruit, 2 slices of bacon, 2 boiled eggs, black coffee (no sugar) or unsweetened tea. Lunch: 1/2 grapefruit, 1 cup of salad with low-calorie dressing, 8 ounces of lean chicken or water-packed tuna fish, black coffee (no sugar) or unsweetened tea. Dinner: 1/2 grapefruit,as much salad with low-calorie dressing as desired, 8 ounces of lean chicken, lean beef, or fish, black coffee (no sugar) or unsweetened tea. No snacks are allowed, and the only seasonings permitted for the meat or fish are herbs; no soy sauce, mustard, ketchup, or other condiments are allowed. * From http://www.diet.com/g/grapefruit-diet

12. Does it Work? Unfortunately, like many other fad diets, this diet is not a good one according to scientists It is unhealthy to cut certain nutrients from you diet Like mentioned before, this diet requires only 800 cal per day to be consumed. Most teenagers and adults need around 2000- 2500 cal per day. This lack of energy may indeed help lose weight but it is temporary and unhealthy

13. Does it Work cont’d A hint of truth can be found in this diet Grapefruits are very healthy fruits that contain lots of Vitamin C. However, grapefruits don’t possess the magical powers of breaking down fat. Eating any other citrus fruit would produce the same results as the grapefruit

14. Does it Work cont’d Another thing is that eating half of a fruit before a meal will let you eat less and feel more satisfied due to the extra water This could result in less nutrients and fat Weight loss may occur but it will most likely be temporary Losing 10 pounds in 10 days will result in gaining it all back in the same amount of time if not faster

16. Health Grapefruit is very healthy so there is no problem in eating half a grapefruit before a meal The problems occur when only 800 calories are eaten Vitamin C in grapefruit will help health conditions and blood pressure

17. Health cont’d Plant chemicals called phytochemicals which are in grapefruit are very healthy and reduce risk of contracting chronic diseases. The diet will not help dieters lose weight in a healthy way, therefore it is not recommended for the purposes of dieting. You should always have the proper amount of calories in your diets and exercise should be involved

18. Science A 12 week study led by Dr. Ken Fujioka found that there was weight loss in most patients because chemicals in grapefruit reduce insulin levels to encourage weight loss Maria Adams, MS, MPH, RD, writes that a small lab did prove some weight loss but the original diet methods are unhealthy and not recommended

19. SOURCES http://www.precisionnutrition.com/rr-grapefruit-diet http://www.webmd.com/diet/grapefruit-diet http://www.everydayhealth.com/diet-nutrition/grapefruit-diet.aspx http://www.diet.com/g/grapefruit-diet http://www.hc-sc.gc.ca/fn-an/food-guide-aliment/basics- base/1_1_1-eng.php http://www.netfit.co.uk/dieting/advice/grapefruit_diet-mayo.htm http://www.medicalnewstoday.com/releases/5495.php http://www.med.nyu.edu/content?ChunkIID=201796 IMAGES FROM GOOGLE

20. THE END