How Nutritional Needs Shift in Your 40s

Ageing changes how your body absorbs, uses, and requires certain nutrients. Hormonal shifts, a slower metabolism, reduced bone density, and declining muscle mass all signal that your plate needs to evolve. Understanding which nutrients deserve more attention is one of the most powerful steps you can take for your long-term health.

The 7 Nutrients to Prioritise After 40

1. Protein

Muscle loss accelerates after 40, making adequate protein intake essential. Protein supports muscle repair, satiety, and metabolic function. Spread your intake throughout the day rather than loading it into one meal for best absorption.

Best sources: Chicken breast, salmon, eggs, Greek yogurt, lentils, edamame.

2. Calcium

Bone density peaks in your 30s and gradually declines after that. Calcium is the cornerstone mineral for bone health. Women especially face increased risk of osteoporosis post-menopause, making this nutrient critical.

Best sources: Dairy products, fortified plant milks, sardines with bones, kale, broccoli, almonds.

3. Vitamin D

Vitamin D works hand-in-hand with calcium to protect bones, but it also plays roles in immune function, mood regulation, and muscle strength. Many adults over 40 are deficient, particularly those in northern climates or with limited sun exposure.

Best sources: Fatty fish, egg yolks, fortified foods, and sensible sun exposure. Supplementation is often recommended — discuss with your doctor.

4. Magnesium

Magnesium is involved in hundreds of biochemical reactions, including blood sugar regulation and blood pressure management — both of which become more important after 40. It also supports sleep quality, which tends to deteriorate with age.

Best sources: Leafy greens, pumpkin seeds, dark chocolate, black beans, avocado, whole grains.

5. Omega-3 Fatty Acids

These healthy fats are powerful anti-inflammatories. Chronic low-grade inflammation is increasingly linked to age-related weight gain, joint pain, cardiovascular disease, and cognitive decline. Omega-3s help counter this process.

Best sources: Fatty fish (salmon, mackerel, sardines), walnuts, flaxseeds, chia seeds.

6. Fibre

Digestive efficiency can slow after 40, and the risk of type 2 diabetes increases. Fibre supports gut health, keeps blood sugar stable, lowers cholesterol, and helps you feel full longer — all critical for weight management.

Best sources: Oats, legumes, berries, apples, broccoli, whole grains, flaxseeds.

7. B Vitamins (especially B12)

The ability to absorb vitamin B12 from food can decline with age due to reduced stomach acid production. B12 is essential for nerve function, energy production, and red blood cell formation. B6 and folate also support heart health and cognitive function.

Best sources: Meat, fish, dairy, eggs. Fortified cereals and supplements are important options for those who eat less animal protein.

A Simple Daily Checklist

  • Include a protein source at every meal
  • Eat at least 2 servings of leafy greens daily
  • Have 1–2 servings of fatty fish per week
  • Choose whole grains over refined carbohydrates
  • Snack on nuts and seeds instead of processed foods
  • Consider a vitamin D and B12 supplement if dietary intake is low

Small, consistent changes to your daily nutrition can make a profound difference in how you look, feel, and age. Start by focusing on one or two nutrients at a time, then build from there.