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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 (so as not to rise and fall throughout the day) is one way to reduce hunger and make sugar in the body more likely to be used for energy rather than stored as unwanted fat. According to Emma Baum of Diabetes UK (a charity), “If grapefruit does significantly lower insulin levels, this could be a potentially exciting discovery.”

Dr. Fujioka further stated, “For years people have talked about the grapefruit diet, and some even swear by it, but now we have data that grapefruit helps weight loss.” As grapefruit is low glycemic (because of its fiber and unique phytochemicals) and has a glycemic load value of four (less than 10 is considered low), it should be a staple in the diet. Most fruits, whole grains, vegetables, legumes, natural beans and of course, protein foods, have a low or reduced glycemic value.

As stated earlier, grapefruits contain some unique phytochemicals. Among these are narginenin. These agents have also been noted to affect drug metabolism, making it important for those who take cholesterol-lowering medications, anti-HIV/AIDS medications and some other medications to learn whether eating grapefruit, drinking the juice or taking the capsules would negatively impact the manner in which the medication works in their bodies. Always ask your pharmacist or doctor about any “food-drug” interactions with any prescribed medicine.

In a recent study, the effects of grapefruit intake were compared to other fruits or sugar-containing foods. The perception of 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.

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