1, grapefruit can't be eaten with crabs. Eating grapefruit and crabs together will stimulate the gastrointestinal tract, causing abdominal pain, nausea, vomiting and other symptoms.

2. carrots and cucumbers can't be eaten with grapefruit. Eating together will destroy the nutritional value of vitamin C in grapefruit.

3. Pig liver can't be eaten with grapefruit. Pig liver is rich in copper, iron and zinc. Once it meets vitamin C in grapefruit, it will accelerate the oxidation of metal ions and destroy the original nutritional value.

People with stomach trouble and duodenal ulcer should stay away from grapefruit. In addition, people with diarrhea due to spleen deficiency will have diarrhea because their ability to absorb and transform food nutrition is weak. Crude fiber grapefruit may be excreted before digestion, causing the illusion of so-called damp heat.