Alfred Hitchcock on a grapefruit diet.

It is now regarded as a classic fad diet like the grapefruit diet or the cabbage soup diet.

Grapefruit forms a core part of the "grapefruit diet", the theory being that the fruit's low glycemic index is able to help the body's metabolism burn fat.

Others, such as the well-known grapefruit diet (also called the Hollywood Diet), rely on eating a lot of the same low-calorie food or foods.

One of those mysterious urban dieting legends, the grapefruit diet has been around since about the 1930s.

The grapefruit diet is a low-carb diet.

The grapefruit diet restricts consumption of carbohydrates by eliminating sugar, sweet fruits and vegetables, grains and cereals.

The grapefruit diet lasts for 10 to 12 days followed by 2 days off.

However, the study involved a healthy diet with the addition of grapefruit, in contrast to a normal "grapefruit diet".

From hot yoga to cold grapefruit diets, such trends make me want to argue.