Episode 13: Immune Fitness with Dr Jenna Macciochi

3 Dec

Healthily | 12/03/20

For obvious reasons, immunity has been a very hot topic this year, as we grapple our way through this global pandemic. However, It goes beyond what we are living through at the moment. Our immune systems hold the key to good physical and emotional health over the long-term; it’s essential to longevity.

In my conversation with the brilliant, kind, calm and ever pragmatic Dr Macciochi, we discuss how little things we do each day can build good immune 'fitness', which will ultimately serve us well if we do find ourselves faced with an infection or similar.

There is lots in the episode: Food, nutrients, stress, sleep and more. The aim in capturing this conversation was to share practical, positive and manageable steps that we can all work towards for overall good immune health.

TAKEAWAYs

✔️ Immune Fitness, Not “Boosting”

The immune system functions best when balanced, not overstimulated.
Effective immunity includes both activating defenses and resolving inflammation.
Quick-fix supplements or diets rarely provide lasting benefits; consistent lifestyle choices matter more.

✔️ Nutrition Matters – But the Pattern is Key

Focus on overall dietary patterns, not individual “miracle” nutrients.
A Mediterranean-style diet rich in diverse fruits, vegetables, lean protein, fiber, nuts, seeds, and spices supports immune function.
Occasional indulgence is fine; the cumulative pattern over time is what counts.
Protein is crucial for building immune cells and antibodies, especially during illness or aging.
Micronutrients work synergistically; supplements may help only if deficiencies exist.

✔️ Vitamin D – Essential Year-Round

Vital for immune defenses, regulating inflammation, and maintaining strong barriers (skin, gut, lungs).
Many people are deficient, especially in winter, older adults, higher body weights, or darker skin tones.
NHS guidance: year-round supplementation, particularly during low sun exposure.
Maintaining steady levels may be more important than reactive supplementation.

✔️ Omega-3 Fatty Acids – Supporting Inflammation Resolution

Found in oily fish or algae-based supplements for vegans/vegetarians.
Help immune cells resolve inflammation and restore tissues post-infection.
Evidence shows benefits in conditions like rheumatoid arthritis; timing and context matter in chronic disease.

✔️ Stress and Mental Health

Chronic stress suppresses immunity via cortisol, increasing susceptibility to infections.
Overworked individuals may experience “leisure sickness” – illness during relaxation periods.
Managing stress improves immune resilience and supports long-term health.

✔️ Sleep – The Immune System’s Reset

About 80% of immune function is under circadian control.
Adequate sleep allows immune repair, cancer surveillance, and tissue restoration.
Individual needs vary; high-stress or physically active individuals may require more.
Evening routines matter: wind down, engage parasympathetic nervous system (laughter, deep breathing), and reduce stimulating activities and screen exposure.

✔️ Lifestyle as a 360° Approach

Good immunity depends on the cumulative effect of diet, sleep, stress management, exercise, and mental health.
Small, consistent steps (“aggregation of marginal gains”) are more effective than extreme measures.

✔️ Social and Health Disparities

Not everyone has access to nutrient-rich foods or time for self-care.
Micronutrient supplementation may benefit at-risk populations, but identifying these individuals can be challenging.