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Engaging in resistance training (like lifting weights) during a fast can help to preserve muscle tissue. Your body responds to resistance training by increasing protein synthesis in muscles, counteracting the muscle breakdown that can occur during a fast. However, you would need to consume enough protein to support this process, which might be difficult if you're only eating one meal a day.
As for your question about eating one meal a day with just protein and salad, that could potentially be better for maintaining muscle than fasting, especially if you're consuming enough protein. The recommended dietary allowance (RDA) for protein is 46 grams per day for women and 56 grams per day for men, but these amounts are minimums and many people, especially those who are physically active, may need more. Consuming enough protein can help to preserve muscle tissue during a fast, especially if you're also engaging in resistance training."
