As people enter their 40s, maintaining good health increasingly involves paying attention to nutrition, physical activity, and the changes that can accompany ageing.
Muscle mass and bone density can decline over time, while the risk of certain chronic conditions rises with age. A balanced diet, regular exercise, and adequate intake of essential nutrients can help support the body’s normal functions.
Some vitamins and minerals are particularly important for maintaining healthy bones, muscles, nerves, and cardiovascular function. Although nutritional requirements vary according to age, sex, medical history, and individual circumstances, several nutrients deserve particular attention during middle age and beyond.
Here are six nutrients to consider and the foods that can help you obtain them.
1. Vitamin B12: Essential for Nerve Function and Red Blood Cells
Vitamin B12 plays an important role in maintaining healthy nerve cells, supporting brain function, and enabling the body to produce red blood cells.
The vitamin is also necessary for DNA production.
Although the recommended daily intake of vitamin B12 remains the same throughout adulthood, some people develop difficulty absorbing it from food as they grow older.
According to the US National Institutes of Health, stomach acid helps release vitamin B12 from proteins in food. Reduced stomach acid production can interfere with this process, increasing the likelihood of deficiency in some older adults.
People over 50 may benefit from obtaining more of their vitamin B12 through fortified foods or supplements because the vitamin in these forms is generally easier to absorb.
Vitamin B12 is naturally present in fish, meat, poultry, eggs, milk, and other dairy products. Fortified breakfast cereals and other enriched foods can also provide the nutrient.
The recommended daily intake for most adults is 2.4 micrograms (mcg).
People who follow vegetarian or vegan diets, have certain digestive disorders, or take medications that interfere with vitamin B12 absorption may require additional attention to their intake.
A healthcare professional can assess whether supplementation is necessary, particularly when a deficiency is suspected.
2. Calcium: Maintaining Bone Strength and Muscle Function
Calcium is widely associated with strong bones and teeth, but its functions extend beyond the skeletal system.
The mineral is necessary for muscle contraction, nerve communication, and normal blood vessel function.
Bones serve as the body’s principal calcium reservoir. When dietary intake is inadequate, the body can draw calcium from bone tissue to maintain the levels required for other essential functions.
Over time, insufficient calcium intake can contribute to reduced bone strength.
The National Institute of Arthritis and Musculoskeletal and Skin Diseases recommends a daily calcium intake of 1,000 milligrams for adults aged 19 to 50.
Women over 50 require approximately 1,200 milligrams daily, while men generally require 1,000 milligrams until age 70 and 1,200 milligrams thereafter.
Good dietary sources of calcium include milk, yoghurt, cheese, calcium-set tofu, fortified foods, and fish such as sardines that are eaten with their bones.
Certain green vegetables, including broccoli and kale, also provide calcium.
Although supplements can help people who struggle to meet their requirements through food, excessive calcium supplementation may increase the risk of kidney stones and other complications.
People considering calcium supplements should discuss their dietary intake and individual risk factors with a healthcare professional.
3. Vitamin D: Helping the Body Absorb Calcium
Vitamin D works alongside calcium to maintain bone health.
Without sufficient vitamin D, the body cannot absorb calcium efficiently, potentially affecting bone strength over time.
The vitamin also contributes to normal muscle function and supports the immune system.
According to the US National Institutes of Health, the body produces vitamin D when skin is exposed to ultraviolet B radiation from sunlight.
However, the amount produced varies according to factors including skin pigmentation, geographical location, season, age, and the extent of skin exposure.
Dietary sources include fatty fish, fish liver oils, egg yolks, and foods fortified with vitamin D, such as certain dairy products and breakfast cereals.
The recommended daily intake for adults aged 19 to 70 is 600 international units (IU), equivalent to 15 micrograms.
For adults over 70, the recommendation increases to 800 IU, or 20 micrograms.
Vitamin D deficiency has been investigated in connection with several chronic conditions, including cardiovascular disease, diabetes, and certain cancers. However, associations between low vitamin D levels and these diseases do not establish that taking supplements will prevent them.
Adults should generally avoid taking more than 4,000 IU daily unless a healthcare professional recommends a higher dose for a specific medical reason.
4. Magnesium: Supporting Muscles, Nerves and Blood Pressure Regulation
Magnesium is involved in hundreds of biochemical processes throughout the body.
It contributes to normal muscle and nerve function, energy production, blood glucose regulation, and the maintenance of healthy bones.
The mineral also helps regulate blood pressure and supports normal heart rhythm.
According to the National Institutes of Health, magnesium is naturally present in numerous plant-based foods.
Good sources include spinach, beans, lentils, nuts, seeds, and whole grains.
The recommended daily intake for adults aged 31 and older is 420 milligrams for men and 320 milligrams for women, although requirements may differ during pregnancy.
Older adults, people with certain gastrointestinal disorders, and those taking particular medications may face an increased risk of magnesium deficiency.
However, a deficiency is not inevitable with ageing, and supplements are not necessary for everyone.
Excessive magnesium from supplements or medications can cause diarrhoea, nausea, and abdominal discomfort. Very high doses may lead to more serious complications.
5. Potassium: Important for Heart and Muscle Function
Potassium helps maintain normal fluid balance, supports nerve signalling, and enables muscles to contract properly.
It also contributes to normal heart function and plays a role in blood pressure regulation.
Diets containing adequate potassium and relatively little sodium can help support healthy blood pressure.
Potassium is widely available in everyday foods, including bananas, oranges, potatoes, tomatoes, spinach, beans, lentils, yoghurt, and fish.
The National Institutes of Health recommends a daily potassium intake of 3,400 milligrams for adult men and 2,600 milligrams for adult women.
Most healthy adults can obtain potassium through a varied diet.
However, people with chronic kidney disease or those taking certain medications for high blood pressure and heart disease may have difficulty regulating potassium levels.
For these individuals, excessive potassium intake, particularly from supplements or potassium-based salt substitutes, can cause dangerously elevated blood potassium levels.
Potassium supplements should therefore not be taken routinely without considering kidney function, medication use, and medical advice.
6. Omega-3 Fatty Acids: Supporting Cardiovascular Health
Omega-3 fatty acids are essential components of a healthy diet and contribute to several important bodily functions.
They are involved in the structure of cell membranes and support normal cardiovascular and neurological function.
The three principal omega-3 fatty acids are alpha-linolenic acid (ALA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).
ALA is found mainly in plant foods, including flaxseeds, chia seeds, walnuts, and certain vegetable oils.
EPA and DHA are present primarily in fish and other seafood.
According to the National Institutes of Health, research has associated fish consumption with cardiovascular benefits, particularly when fish replaces foods higher in saturated fat.
Omega-3 fatty acids have also been studied for their possible role in maintaining cognitive function during ageing.
However, clinical trials have not established that routine omega-3 supplementation prevents cognitive decline in otherwise healthy older adults.
Fish oil supplements can lower triglyceride levels, but their effects on cardiovascular outcomes vary according to the individual, formulation, and dose.
Eating fish as part of a balanced diet offers a way to obtain omega-3 fatty acids alongside protein and other essential nutrients.
People considering high-dose omega-3 supplements for a medical condition should seek professional advice.
A Balanced Diet Remains the Foundation of Healthy Ageing
Nutritional needs do not change dramatically for everyone at the age of 40. Nevertheless, changing dietary habits, medication use, and health conditions can affect how much of a particular nutrient a person needs or absorbs.
A diet that includes vegetables, fruits, legumes, whole grains, protein-rich foods, and appropriate sources of healthy fats can provide many of the nutrients required for normal bodily function.
Regular physical activity, including resistance exercise, also helps preserve muscle strength and supports bone health as people age.
Supplements can be useful when dietary intake is inadequate or a deficiency has been identified, but they should not automatically replace nutritious foods.
Before beginning a new supplement regimen, particularly when taking prescription medication or managing an existing medical condition, individuals should consult a qualified healthcare professional.
Articles on The Trent: 5 Mistakes That Are Wrecking Your Healthy Diet
