Nutrition After 65: Key Nutrients That Often Fall Short

Why Nutritional Needs Shift After 65

Aging changes how the body absorbs, processes, and uses nutrients — often independently of how much food a person eats. Stomach acid production tends to decline with age, impairing the absorption of several key vitamins and minerals. Appetite often decreases, caloric needs drop, yet micronutrient requirements either hold steady or increase. The result is a narrower margin for error in food choices.

According to national dietary surveys, several specific nutrients are consistently underconsumed among adults 65 and older. Understanding which gaps are most common — and which foods can help address them — is a practical first step. This article is general health information and is not a substitute for personalized guidance from a registered dietitian or physician.

For a broader picture of how your body's priorities evolve decade by decade, see Healthy Aging Across Your 60s, 70s, and 80s.

The Nutrients Most Commonly Running Low

Research consistently identifies a core group of nutrients that fall short in older adults' diets. Below is a reference overview of each, along with the dietary sources most likely to help.

Vitamin D

Skin becomes less efficient at synthesizing vitamin D from sunlight with age, and many older adults spend limited time outdoors. Fatty fish such as salmon and mackerel, fortified dairy products, and eggs provide dietary vitamin D, though food sources alone are often insufficient. Outdoor activity also supports vitamin D levels and offers additional health benefits.

Calcium

Bone density naturally decreases with age, and adequate calcium intake remains important throughout later life. Dairy products, fortified plant milks, canned fish with soft bones (such as sardines), and dark leafy greens like kale and bok choy are reliable sources. Calcium absorption also depends on sufficient vitamin D, which underscores the importance of addressing both together.

Vitamin B12

Reduced stomach acid — common after 65 — impairs the body's ability to extract B12 from food proteins. Animal products including meat, poultry, fish, eggs, and dairy contain B12, and fortified foods can supplement intake. Because absorption through the gut is the primary challenge, a healthcare provider may assess B12 status through a blood test and discuss whether supplementation is appropriate.

Magnesium

Magnesium supports muscle and nerve function, blood glucose regulation, and bone health. Nuts, seeds, legumes, whole grains, and dark leafy greens are the richest dietary sources. Many older adults fall short simply because ultra-processed foods have largely displaced these whole-food options.

Potassium

Adequate potassium is linked to blood pressure regulation and cardiovascular health. Fruits, vegetables, legumes, and dairy provide meaningful amounts. Older adults on certain diuretic or blood pressure medications should discuss potassium needs with their prescribing clinician, as requirements vary.

This article is for informational purposes only and is not medical advice. Consult a qualified healthcare professional before making changes to your diet or starting any supplement regimen.

Practical Steps to Close the Gap

Dietary patterns matter more than single foods. A consistent emphasis on whole, minimally processed foods — including vegetables, legumes, lean proteins, dairy or fortified alternatives, and whole grains — naturally delivers most of the nutrients older adults need. A few targeted strategies can also help:

• Pair nutrients that work together: Vitamin D aids calcium absorption; vitamin C enhances iron uptake from plant sources. Building meals around complementary foods improves efficiency.
• Check labels on fortified foods: Many breakfast cereals, plant-based milks, and orange juice products are fortified with vitamin D, calcium, and B12. Reading nutrition labels carefully helps you identify useful sources at a glance.
• Request periodic blood work: Nutrients like vitamin B12, vitamin D, and magnesium can be measured through routine laboratory tests. Annual health checks are a natural opportunity to flag any concerns with your provider.
• Consult a registered dietitian: If appetite is poor, chewing is difficult, or multiple health conditions affect food choices, a dietitian can create an individualized plan that accounts for your specific circumstances.

For a deeper look at how lifestyle choices — including diet — intersect with longevity research, explore The Science Behind Healthy Aging.

This article is for general informational and educational purposes only. It does not constitute medical or dietary advice. Please consult a licensed healthcare professional or registered dietitian for guidance tailored to your individual health needs.