De effective substance is called naringin and gives the grapefruit its typical bitter taste. This bitter plant liquid is supposed to make the liver burn more fat instead of storing it after a meal. Furthermore it is supposed to regulate the insulin and glucose levels.
In the research two groups of mice got a Western style diet to promote the development of type 2 diabetes. One group was treated with naringin and the other was not.
In the group that did not get naringin, the mice became obese, their cholesterol levels rose and the mice developed insulin resistance. The group that did get naringin didn’t develop any of these diseases.
The downside is that the naringin was given in very high doses. You can never eat enough grapefruits to reach that dose.
Those who want to enjoy the beneficial effect of naringin will have to turn to food supplements.
In the mean time try this chicken with grapefruit marinade recipe.
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