Basically, a person may have trouble breaking down a food, perhaps because of enzyme deficiencies or because of chemicals found in the food that are difficult to process.
पण जेव्हा तो आपण पुन्हा खातो तेव्हा आपल्याला अॅलर्जी का होते, हे आपल्याला वरील गोष्टीवरून कळतं.