Doctors advise not to eat food items at the time of fever. What are the reasons for this?

Ramu unable to eat food due to red, glazed tongue. What in the reason for this?

at the time fever why cannot we taste the food

We should not eat food items beyond the expiry date .

Doctors advised to use 2D lens. What is its focal length ?

It is advised not to talk or laugh louder while eating. Can you give the reason?

Due to hectic and busy schedule, Mr. Singh started taking Junk food in the lunch break and slowly became habitual of eating food irregularly to excel in his field. One day, during a meeting he felt severe chest pain and fell down. Mr. Khanna, a close friend of Mr. Singh took him to doctor immediately. The doctor diagnosed that Mr. Singh was suffering from acidity and prescribed some medicines. Mr. Khanna advised him to eat homemade food and change his lifestyle by doing yoga, meditation and some physical exercise. Mr. Singh followed his friend's advice and after few days he started feeling better. What are the values (atleast two) displayed by Mr. Khanna?What are antacids? Give one Example. Would it be advisable to take antacids for a long period of time? Give reason.