1. To tell the truth: You can tell the blind date how you feel and tell him/her that you don't feel suitable because you prefer healthy people.
2. Avoid hurting: When refusing, pay attention to the wording to avoid hurting the other person's self-esteem. You can try to say something like "We are not suitable" or "I don't like your type very much".
3. Give reasons: If you feel it necessary to give more reasons, you can say that you prefer people with healthy living habits and active exercise, or that you value physical health and appearance more.
4. Respect each other: No matter how you refuse, you should respect each other's feelings and avoid using hurtful words or attitudes.
In a word, refusing blind date needs to express your thoughts euphemistically, and at the same time, you should respect each other's feelings and avoid hurting each other's self-esteem.