Things That Suppress Your Immune System
Lack of Sleep
Anxiety
Low Vitamin D
Certain Medications
Too Few Fruits and Veggies
Marijuana
High-Fat Diet
Too Little Time Outdoors
Smoking
Alcohol
Grief
Lack of Exercise
No Sex
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SOURCES:
Academy of Nutrition and Dietetics: “Support Your Health With Nutrition.”
Alcohol Research: “Alcohol and the Immune System.”
American Academy of Family Physicians: “Health Benefits of a Good Sex Life.”
American Council on Exercise: “Get Out! 5 Benefits of Outdoor Exercise.”
American Psychological Association: “Stress Weakens the Immune System.”
American College of Rheumatology: “TNF Inhibitors.”
BMJ Journals Thorax: “Pro-inflammatory effects of e-cigarette vapour condensate on human alveolar macrophages.”
Breastcancer.org: “How Chemotherapy Affects the Immune System.”
British National Health Service: “Benefits of love and sex.”
CDC: “Alcohol and Public Health,” “Marijuana and Public Health,” “Medications that Weaken Your Immune System and Fungal Infections.”
Cleveland Clinic: “6 Surprising Ways Alcohol Affects Your Health — Not Just Your Liver,” “FAQs: What You Should Know About COVID-19 and Chronic Medical Conditions.”
Dialogues in Clinical Neuroscience: “Physiological correlates of bereavement and the impact of bereavement interventions.”
Frontiers in Immunology: “Debunking the Myth of Exercise-Induced Immune Suppression: Redefining the Impact of Exercise on Immunological Health Across the Lifespan.”
Frontiers in Psychology: “How might contact with nature promote human health? Promising mechanisms and a possible central pathway.”
Georgetown University Medical Center: “Sunlight Offers Surprise Benefit – It Energizes Infection Fighting T Cells.”
Harvard Health Publishing: “How to boost your immune system,” “Grief can hurt — in more ways than one,” “A prescription for better health: go alfresco.”
Harvard Medical School Division of Sleep Medicine: “Sleep and Disease Risk.”
Indian Journal of Medical and Paediatric Oncology: “Harmful effects of nicotine.”
Mayo Clinic: “Lack of sleep: Can it make you sick?”
National Cancer Institute: “Vitamin D and Cancer Prevention.”
National Kidney Foundation: “Immunosuppressants.”
National Institute on Alcohol Abuse and Alcoholism: “Alcohol's Effects on the Body.”
National Institute on Drug Abuse: “What are marijuana's effects on lung health?”
National Office of Dietary Supplements: “Vitamin D.”
New England Journal of Medicine: “Adverse Health Effects of Marijuana Use.”
Oxidative Medicine and Cellular Longevity: “High anxiety
Recognizing stress as the stressor.”
Public Health Review: “Anxiety and Depression: Linkages with Viral Diseases.”
Physicians Committee for Responsible Medicine: “Foods To Boost the Immune System.”
PlosONE: “Exposure to Electronic Cigarettes Impairs Pulmonary Anti-Bacterial and Anti-Viral Defenses in a Mouse Model.”
Psychological Reports: “Sexual frequency and salivary immunoglobulin A (IgA).”
Psychosomatic Medicine: “A Systematic Review of the Association Between Bereavement and Biomarkers of Immune Function.”
World Health Organization: “Ultraviolet radiation (UV).”