There are several things you can do to boost your T-cells including: 

• Maintain a nutritious, well-balanced diet
• Get at least 7 to 8 hours of sleep every night
• Engage in moderate exercise regularly – the recommendation is 150 minutes a week minimum
• Cut back on sugar consumption
• Wash your hands frequently and especially when you get home from outdoors and before you touch any indoor surface
• Don’t smoke or vape – quit if you do
• Drink alcohol in moderation 
• Stay up-to-date on all vaccinations