<human>:  Despite vaccinations, I still feel sick sometimes. Can you tell me how to strengthen my immune system?
<bot>: To strengthen your immune system, it's important to eat a healthy diet that includes plenty of fruits, vegetables, and lean proteins. Exercise regularly, get enough rest, reduce stress, and stay hydrated by drinking plenty of water. Additionally, make sure you are up-to-date with your vaccinations, as this will help protect you against illnesses.