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Rainy Season! Why Do You Feel Lazy, Easily Fatigued, and Have Lower Immunity? Because 80% of City Dwellers Knowingly Lack 'Vitamin D'

Last updated: 8 Jul 2026
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As the rainy season arrives, many people often feel lazy, drowsy, or get sick more easily than usual. These symptoms are not just about the cozy weather that makes you want to stay in bed, sweetie. From a longevity perspective, this is a warning sign that the machine called your body is lacking the fine-tuning of an essential nutrient: Vitamin D.

1. Vitamin D: More Than Just Bone Support, It's the Fuel for Your Immune System
Many people misunderstand that Vitamin D is only for bone health. In reality, this vitamin acts more like a hormone that regulates the function of over 2,000 genes in the body:

Immune System: Vitamin D plays a crucial role in the functioning of the immune system, helping the body fight off pathogens better during the rainy season.
Energy Levels and Mood: Maintaining optimal Vitamin D levels helps reduce fatigue and prevents Seasonal Affective Disorder (SAD), keeping you feeling refreshed and not easily exhausted.


2. Why Do City Dwellers Unknowingly Lack "Vitamin D"?
Even though Thailand is a tropical country, most city dwellers actually suffer from a deficiency of this nutrient:

Avoiding the Sun: Working in offices and using sunscreen prevents the body from receiving the UVB rays necessary for synthesizing Vitamin D.
Silent Signs: Vitamin deficiency often doesn't show clear symptoms at first, but it may start with minor irregularities, such as getting sick frequently or feeling more tired than usual.


3. Bio-Hack Your Body: Check to Know Your "Optimal" Value
True anti-aging comes from having detailed information about yourself. An Advanced Health Check-up will ensure you no longer have to guess:

Blood Vitamin Level Test: To see if your Vitamin D level is at the most appropriate point for cellular function.
Personalized Care Adjustment: Once you know the test results, you can choose to supplement vitamins in the exact amount your body truly needs, allowing your body to become vibrant and strong from within.


4. Conclusion: Don't Let Your Body Deteriorate with the Seasons
Knowing and understanding your own health is the secret key to sustainable longevity. Checking vitamin and mineral levels, as well as inflammation levels in the body (hs-CRP), will help you plan precisely for the rainy season, keeping your body looking youthful and always full of energy.

References:

• World Health Organization (WHO): Preventive Health Screening and Ageing
• Harvard Health Publishing: The Science of Healthy Ageing
• Mayo Clinic: Advanced health check-up for disease prevention
• Department of Health, Ministry of Public Health


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