Grapefruit Diet


The Scripps-Citrus Connection
The Florida Department of Citrus asked Ken Fujioka, MD, of the famed Scripps Research Institute in San Diego, California, to carry out a study evaluating whether eating a grapefruit (1/2 with each meal), or drinking grapefruit juice (three servings daily), or taking grapefruit powder (capsules) would have any different effects on bodyweight or metabolic variables (e.g. blood sugar, insulin, etc.). than drinking apple juice daily.
This 12-week “grapefruit diet” study enrolled 100 obese participants and asked them to maintain their daily eating habits except for the addition of one of the grapefruit variants and to slightly enhance the amount of exercise they were accustomed to doing. Thus, the only real apparent variable would be the grapefruit (or derivative).
Startling Study Result
Typical weight loss for a person who is dieting would be in the range of six to 12 pounds over a three-month period. Keep in mind that in this study, the participants were not dieting. On average, those who ate a ½ grapefruit three times a day (as an appetizer or part of the meal) lost 3.6 pounds on average, those who drank a six-ounce serving of grapefruit juice three times per day lost 3.3 pounds and those who took the grapefruit capsules lost 2.4 pounds. In fact, the only group that did not lose weight was the group that drank apple juice!
Why Would Grapefruit Help with Weight Loss?
Dr. Fujioka also found that grapefruit appears to reduce insulin levels and thus, affects blood sugar regulation. Bear in mind that your pancreas secretes insulin in response to the amount of carbohydrate ingested (also affected by the glycemic index and glycemic load of a food or meal) and that grape fruit by itself is considered by some to be low glycemic.
Insulin has a few functions in the body. It assists in the regulation of blood sugar (by shuttling sugar into muscle cells for use as energy) and it also affects the conversion of glucose into triglycerides for storage as body fat (a very simplified explanation of a complex process). It has been said that keeping insulin, and thus blood sugar levels, stable sweetness and acceptability as compared to other foods was evaluated. The end result indicated that grapefruit was very well accepted and that it caused less of a change in blood sugar values than other foods with a similar sugar content. Thus, the confirmation of grapefruit as a “stabilizing” food to be included in your daily diet appears to be quite valid. According to David Katz, MD, “Eating grapefruit is a good idea; it is packed with vitamins that promote good health, and with its tangy flavor it can provide welcome relief from sugar-laden American diets.” In other word, eating a ½ grapefruit, drinking the juice or even taking the capsules all promote a healthier body-weight.