Grapefruit varieties are red, pink or white in color and may come with seeds or may be seedless. Its size may vary from four to six inches round. The red and pink colored grapefruits have higher calories compared to the white. Also, the larger fruits have more calories than the smaller ones.
Summary. 1  Loss of appetite can cause fatigue due to low calorie intake and nutrient deficiency. 2  Fatigue means being constantly tired. 3  It may be a sign of an underlying health condition if youâre feeling fatigue, loss of appetite, and other symptoms such as vomiting and bloating.
Some people experience fatigue due to what's known as unrefreshing sleep. This means you've had enough sleep -- usually seven or more hours -- but you wake up and still feel tired, because the sleep was of poor quality, interrupted, or did not reach restorative levels.