7 Foods that You Shouldn't Reheat Them Because Of Toxicity

 2. Celery

3. Beets

4. Chicken 

5. Fresh mushrooms

6. potato

7. Spinach

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Sources

https://www.insider.com/foods-you-should-not-eat-as-leftovers-2018-9#you-probably-shouldnt-reheat-your-chicken-3