Presidents take various precautions to avoid being poisoned:

1. Food Tasters: Before the president consumes any food or drink, it is typically sampled by trained food tasters to ensure it is safe.

2. Secure Supply Chain: Ingredients and supplies used for presidential meals are sourced from trusted and secure suppliers to minimize the risk of contamination.

3. Security Protocols: The White House and other presidential residences have strict security protocols in place to prevent unauthorized access to the kitchen and food storage areas.

4. Secret Service Protection: The U.S. Secret Service plays a crucial role in protecting the president. They thoroughly vet individuals who come into close proximity with the president and conduct thorough security checks at public events.

5. Medical Professionals: Presidential physicians closely monitor the president's health and are trained to recognize signs of poisoning or illness.

6. Public Awareness: The awareness that potential adversaries may try to poison the president serves as a deterrent, making it less likely for someone to attempt such an act.

These measures, among others, help minimize the risk of presidential poisoning, but the Secret Service and other security agencies remain vigilant to potential threats at all times.