Flu season has a way of arriving just as calendars start filling with holiday plans, family gatherings, and travel. This year, the Bay Area has already seen an unusually early increase in flu activity—a useful reminder to prepare before illness interrupts something you were looking forward to. Preparation doesn’t need to mean a cabinet overflowing with “immune boosters.” A thoughtful approach combines annual vaccination, nourishing food, restorative sleep, sensible precautions, and knowing when to call your healthcare provider.

At Energize Health & Hormones, that whole-person perspective brings preventive medicine and everyday health habits into the same conversation. Each has a role in helping you stay well through the season.

Give your immune system something to work with

Your immune system depends on adequate nutrition to function well. The goal is to consistently provide the nutrients your body needs for normal immune defenses. Start with meals that include vegetables or fruit, adequate protein, fiber-rich foods, and healthy fats. Think vegetable soup with beans or chicken, oatmeal with berries and nuts, or fish with roasted vegetables and brown rice. These meals provide a range of nutrients without requiring a complicated seasonal eating plan.

Protein helps build and maintain tissues and immune components. Vitamins and minerals—including vitamins A, C, and D, along with zinc—also contribute to immune function. Deficiencies can interfere with those processes, which is one reason restrictive eating patterns or ongoing digestive problems deserve attention. A varied diet also supports the gut microbiome, which interacts with the immune system. Vegetables, beans, whole grains, nuts, seeds, and fermented foods, when tolerated, can be useful parts of that foundation. Supporting gut health is a worthwhile long-term habit, although it doesn’t guarantee protection from influenza.

Move your body regularly. Exercise is one of the most consistently supported ways to promote immune health. Research has found that people who are regularly physically active have a lower risk of respiratory infections and serious illness. Interestingly, studies also suggest that regular exercise can improve the body’s antibody response to the flu vaccine, particularly in older adults. Aim for at least 150 minutes of moderate-intensity exercise each week, along with strength training twice weekly. Even regular brisk walking can make a difference.

The Flu Vaccine: Why It Matters

It’s easy to think of the flu as just another seasonal illness, but influenza can be much more serious than many people realize. In the United States, flu causes millions of illnesses, hundreds of thousands of hospitalizations, and tens of thousands of deaths during severe seasons. Among people hospitalized with influenza, approximately 1 in 5 may require intensive care. And while older adults and those with underlying health conditions are particularly vulnerable, even otherwise healthy children and adults can become seriously ill.

Vaccination makes a meaningful difference. Although the flu vaccine isn’t perfect and its effectiveness varies from year to year, its greatest benefit is helping prevent serious illness and complications. Research from the particularly severe 2024–2025 flu season found that vaccinated adults, compared with unvaccinated adults, had:

• 40% lower risk of hospitalization from influenza.
• 58% lower risk of ICU admission due to influenza.
• 52% lower risk of death from influenza.

Children also benefit significantly from vaccination, with studies showing meaningful reductions in flu-related medical visits and hospitalizations. Young children have high rates of severe flu even when they have no medical conditions. The vaccine prevents about 52–67% of flu-related doctor visits and hospital stays in children. Over the past 8 flu seasons, a flu shot lowered a child’s risk of dying from flu by about 80%. Half of the children who died were healthy beforehand, and almost none of them had been vaccinated.

And the impact extends far beyond individual patients. During the 2024–2025 flu season, the CDC estimates that vaccination prevented approximately 10 million illnesses, 180,000 hospitalizations, and 12,000 deaths across the United States.
The takeaway? Even if the flu vaccine doesn’t prevent every infection, it can significantly reduce your risk of becoming seriously ill. That’s a powerful reason to get vaccinated each year.

Why get a flu shot every year?

Influenza viruses change, and protection from previous vaccination decreases over time. Each season’s vaccine is designed to protect against the flu viruses expected to circulate. Annual flu vaccination is recommended for almost everyone ages six months and older, with rare exceptions. September and October are generally good times to receive it, but vaccination later in the season can still be helpful while flu is circulating. Protection takes about two weeks to develop, so waiting until everyone around you is coughing leaves a gap.

The vaccine cannot prevent every infection, and its effectiveness varies from year to year. It can, however, reduce your risk of flu and help protect against serious illness and complications. Getting sick after vaccination doesn’t necessarily mean the vaccine provided no benefit. Your age, health history, and previous vaccine reactions can help guide the conversation about which option is appropriate for you. This is also a good opportunity to review whether you’re due for updated COVID-19 vaccination or eligible for RSV protection.

What about vitamin D and other supplements?

Vitamin D has important roles in immune function and bone health. For someone with a deficiency or a medical reason to need supplementation, correcting that gap can be an appropriate part of care. But more is not automatically better. Vitamin D dosing should reflect your individual needs, and testing may be appropriate when your history or health circumstances warrant it. High doses and unnecessarily high blood levels can cause harm.

The same thoughtful approach applies to zinc, vitamin C, probiotics, and herbal products. Some have been studied for common colds, but evidence about a cold remedy cannot automatically be applied to influenza. There isn’t strong evidence that natural products reliably prevent or treat the flu.

If supplements are part of your routine, review them with your healthcare team. The most useful plan considers your diet, medications, health conditions, and any nutrient deficiencies instead of simply adding more products when fall arrives.

Make room for sleep and recovery

Busy seasons often come with later nights, hurried meals, and the conviction that we can catch up on rest sometime in January. Unfortunately, the body doesn’t work on that scheduling system. Adequate sleep, regular physical activity, and attention to stress support overall health and normal immune function. A consistent sleep schedule, manageable exercise, and short breaks during demanding days are practical places to begin.

If hot flashes, insomnia, anxiety, or another ongoing concern keeps disrupting your sleep, bring it up at your next appointment. Addressing what interferes with rest can make those familiar “get more sleep” recommendations much more achievable.

Remember the air you share

Handwashing still matters, but respiratory illness prevention also includes the air around you. When practical, bring fresh air indoors, improve ventilation, or use an appropriately sized portable air cleaner. Outdoor gatherings can be another option when the weather cooperates. A well-fitting mask adds protection in crowded indoor spaces, particularly when illness is circulating or you’re spending time with someone at higher risk.

Wash your hands with soap and water, cover coughs and sneezes, and give yourself permission to stay home when you’re sick. These measures work together to reduce opportunities for viruses to spread.

If symptoms start, don’t wait to ask for help

Flu can come on suddenly, with body aches, chills, fatigue, cough, and sometimes fever. Because respiratory infections can have overlapping symptoms, testing may help your clinician determine what’s causing your illness and which treatment makes sense. Prescription flu antivirals work best when started within the first 48 hours of symptoms.

Contact your healthcare provider promptly if you suspect flu, especially if you’re pregnant, age 65 or older, immunocompromised, or living with a condition such as asthma, diabetes, or heart disease. Treatment may still help after 48 hours for people at higher risk or with severe illness, so don’t assume you’ve missed your chance to get care. Rest, fluids, and appropriate symptom relief can support recovery. Seek urgent medical attention for trouble breathing, persistent chest pain, confusion, or other severe symptoms.

Build a prevention plan that fits your life

You don’t need a perfect diet or an elaborate supplement routine to take meaningful steps toward staying well. Vaccination, steady daily habits, and timely medical care give you a practical foundation for the months ahead. Flu vaccine are usually readily available at your pharmacy including; CVS, Walgreens, Safeway.

The team at Energize Health & Hormones can help you review your vaccination needs, discuss nutrition and supplements, and address health concerns that may affect your resilience through the season. Call 415-548-7901 to schedule an appointment and create a prevention plan that fits your health, your priorities, and your life.