Red grapefruit is not high in calories, for every 100g of edible red grapefruit, the total calorie is about 42kcal, which is a kind of low calorie fruit. The main component of red grapefruit is water, the content is 89g/100g, followed by carbohydrates, the content is 9.5g/100g. the content of dietary fiber in red grapefruit is 0.4g/100g, and the fat and protein is very little. Therefore, red grapefruit has a low calorie content of 42kcal per 100g, which is not high. Red grapefruit contains a variety of vitamins and minerals. Red grapefruit contains vitamin C, carotene and other vitamins. The potassium content of red grapefruit is 119mg/100g, which belongs to the high potassium and low sodium food, suitable for patients with high blood pressure and other cardiovascular diseases to eat in moderation. Although red grapefruit is low in calories, it is rich in potassium and other elements, so patients with renal insufficiency and hyperkalemia should consume red grapefruit with caution. It is recommended to consume red grapefruit in moderation to avoid excessive consumption causing abdominal pain, diarrhea and other gastrointestinal discomforts.