Why are we normally advised to take bland and nourishing food when we are sick?

$A$ baby is not able to tell her/his caretakers that she/he is sick. What would help us to find out:
$(a)$ that the baby is sick?
$(b)$ what is the sickness?

State any two conditions essential for good health.

Under which of the following conditions is a person most likely to fall sick?
$(a)$ When she is recovering from malaria.
$(b)$ When she has recovered from malaria and is taking care of someone suffering from chicken-pox.
$(c)$ When she is on a four-day fast after recovering from malaria and is taking care of someone suffering from chicken-pox.
Why?

In which of the following cases do you think the long-term effects on your health are likely to be most unpleasant?
$A)$ If you get jaundice,
$B)$ If you get lice,
$C)$ If you get acne.
Why?

What are the different means by which infectious diseases are spread?