Motivation is usually expressed as a mental direction or a desire for doing or rejecting something. It is something that happens within the person, not something done to a person by others. It involves the internal dynamics of behaviours, not external stimuli such as incentives.
In health education, you can appeal to people's motives through motive-arousing discussion, but not through external factors. Rather than 'telling' people the best action they should take, help them to learn about their health and encourage and motivate them to take steps to improve.
Assume that you are conducting a health education session among the antenatal women from your district who are thinking about what they should eat during pregnancy. What mechanisms do you think may be important to use in order to reinforce the messages to your audience? How do you think you might help to motivate them?
Your response may include, but not be limited to: