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Refreshing and delicious grapefruit is rich in phytonutrients like lycopene, vitamin A, and beta-carotene. The fruit is well known as "fruit from the paradise" for its unique health-promoting as well as disease preventing properties, especially among the health-conscious, fitness enthusiasts.
Grapefruit is an evergreen, medium-sized tree grown for its fruit. It grows up to 15 meters in height and bears numerous yellow-orange fruits in clusters during each season. It is, in fact, a natural hybridization of pomelo and orange.
Grapefruit is oblate in shape, ranges in diameter from 3 to 5 inches and can weigh up to 150 g. Characteristically, it has thick, tough skin than that in the oranges. Inside, the fruit is segmented into arils as in other citrus fruits. Its rails are very juicy, acidic, and varying in color depending on the cultivars, which could be white, pink and red of varying sweetness. While some varieties are seedless, there may be up to 50 white, elliptical, pointed seeds about 1/2 inches in length in some.
Health benefits of grapefruit
1) Weight loss
Grapefruit may not be a miracle weight loss food as touted in some previously popular fad diets, but consuming grapefruit as part of a healthy diet may just give you a little boost. The Scripps Clinic 'Grapefruit Diet' study, led by Dr. Ken Fujioka, monitored the weight and metabolic factors of 91 obese men and women for 12 weeks. Each participant was randomly assigned to one of four groups to receive either placebo capsules along with 7 ounces of apple juice, grapefruit capsules with 7 ounces of apple juice, 8 ounces of grapefruit juice with a placebo capsule or half of a fresh grapefruit with a placebo capsule three times a day before each meal.
After 12 weeks, the fresh grapefruit group had lost the most weight at 3.52 lbs, the grapefruit juice group had lost 3.3 lbs, the grapefruit capsule group had lost 2.42 lbs, and the placebo group had lost 0.66 lbs. According to the researchers, there was also a significant reduction in 2-hour post-glucose insulin level in the grapefruit group compared with placebo. Half of a fresh grapefruit eaten before meals was also associated with improved insulin resistance.
According to the American Heart Association, eating higher amounts of a compound found in citrus fruits like oranges and grapefruit may lower ischemic stroke risk for women. Those who ate the highest amounts of citrus had a 19 percent lower risk of ischemic stroke than women who consumed the least.5
3) Blood pressure and heart health
The powerful nutrient combination of fiber, potassium, lycopene, vitamin C, and choline in grapefruit all help to maintain a healthy heart.
One study found that a diet supplemented with fresh red grapefruit positively influences blood lipid levels, especially triglycerides. Researchers concluded that the addition of fresh red grapefruit to the diet could be beneficial for people with atherosclerosis wanting to lower their high lipid levels, especially triglycerides.
In one study, those who consumed 4069 mg of potassium per day had a 49% lower risk of death from ischemic heart disease compared with those who consumed less potassium (about 1000 mg per day).3
High potassium intakes are also associated with a reduced risk of stroke, protection against loss of muscle mass, preservation of bone mineral density and reduction in the formation of kidney stones.3
Increasing potassium intake is also important for lowering blood pressure because of its powerful vasodilation effects.
As an excellent source of the strong antioxidant vitamin C as well as other antioxidants, grapefruit can help combat the formation of free radicals known to cause cancer. Lycopene intake has been linked with a decreased risk of prostate cancer prevention in several studies and foods high in vitamin C and beta-carotene has been shown to lower the risk of esophageal cancer in particular.
5) Digestion and regularity
Grapefruit, because of its water and fiber content, helps to prevent constipation and promote regularity for a healthy digestive tract.
As one of the most hydrating fruits in the world made up of 91% water (just below watermelon) and full of important electrolytes, grapefruit is a great snack to have on hand to prevent dehydration.
The antioxidant vitamin C, when eaten in its natural form (in fresh produce as opposed to supplementing form) or applied topically, can help to fight skin damage caused by the sun and pollution, reduce wrinkles and improve overall skin texture. Vitamin C plays a vital role in the formation of collagen, the main support system of the skin. Hydration and vitamin A are also crucial for healthy looking skin, both of which grapefruits can provide.
However, it is worth taking note of a study published in June 2015 which suggests that consuming grapefruit juice in large amounts may put us at higher risk of melanoma - the deadliest form of skin cancer.
8) Asthma prevention
The risks for developing asthma are lower in people who consume a high amount of certain nutrients. One of these nutrients is vitamin C, found in many fruits and vegetables including grapefruit.