You can eat grapes when you have a cough. A cold can cause a cough, which can also lead to poor appetite and a sore throat. Eating grapes properly can relieve sore throat and poor appetite, and can also give the body the energy it needs to get better from a cold. But try not to eat more, because grapes are sweeter and contain more glucose, if you eat more of this sweet food, it will produce phlegm, making the phlegm more, possibly more sticky, often not easy to cough up, affecting the recovery of the disease. You can eat more pears, which can stop coughing and dissolve phlegm, but also play a role in clearing heat and removing fire, which can help with colds, coughs and phlegm.