Get enough sleep consistently
Eat a balanced diet with adequate protein
Include vitamin C-rich foods
Include vitamin D-rich foods
Include zinc-rich foods
Include selenium-rich foods
Stay well hydrated
Exercise regularly at moderate intensity
Manage stress with relaxation practices
Maintain a healthy body weight
Avoid smoking
Limit alcohol intake
Treat underlying infections promptly
Review medications with a healthcare professional
Address nutrient deficiencies with medical guidance
Keep vaccinations up to date
Practice good hand hygiene
Seek medical evaluation for persistently low lymphocyte counts