Correct Answer: Unhygienic

Solution : The first option is the correct answer.

Unhygienic means not clean or not sanitary. The sentence conveys that consuming unhygienic food can affect our immune systems.

The meanings of the other options are as follows:

• Nutritious means providing the necessary substances for growth, health, and good condition.
• Sanitry means conditions affecting public health, especially cleanliness and hygiene.
• Unwise means something lacking wisdom or good judgement, not showing sound decision-making.

Therefore, the complete sentence is: " Unhygienic food consumption can affect our bodies' immune systems."