How can i eat well during cancer treatment if nausea?

There are drugs.: There are drugs, etc. That can help this. These are antiemetics, like 5-ht3 receptor antagonists, such as ondansetron, which are used to treat cytotoxic drug nausea and vomiting. These have side effects like constipation, dry mouth, and fatigue. Other classes include Dopamine antagonists, antihistamines, and benzodiazapines. Eating small meals and drinking clear liguids can also help.

Graze through day: While patients receiving treatment certainly are helped with anti nausea medications, eating small amounts throughout the day rather than focussing on 3 large meals often is a good strategy.