The 100-Year-Old Harvard Doctor’s Secrets to Graceful Aging: Lessons from Dr. John Scharffenberg

3. Vitamin A importance

Vitamin A, particularly in its beta-carotene form found in plant foods, is critical for maintaining vision, immune function, and skin health as we age. Nearly half of adults do not meet the recommended intake, which can contribute to declining eye health and increased infection risk.

Safe and effective sources include carrots, sweet potatoes, and cantaloupe. Unlike preformed vitamin A from animal sources, beta-carotene has a lower risk of toxicity, making it a preferred choice for long-term supplementation through diet.

4. Vitamin B12 absorption

Vitamin B12 absorption decreases significantly after age 50, even among those who consume animal products regularly. This vitamin is vital for energy metabolism and nerve function, and deficiency can cause fatigue, memory difficulties, and nerve-related symptoms.

Because natural B12 sources are mainly animal-based, individuals over 50 often require fortified foods or daily supplementation to maintain adequate levels. A simple blood test can assess B12 status to guide supplementation needs.

5. Vitamin D deficiency

Vitamin D deficiency is widespread, affecting 70% to 95% of seniors. Adequate vitamin D is essential for calcium absorption, bone strength, and immune system support. Without sufficient levels, the risk of fractures and chronic illnesses increases.

Natural vitamin D comes from sun exposure and fortified foods such as plant-based milks. However, many older adults do not get enough sunlight or dietary sources, making supplementation under medical supervision important. Testing blood levels helps determine appropriate doses.

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