How Your Age Impacts Your Calorie Needs

As we get older, our caloric needs may change. Age, however, is only one of the factors influencing how much energy our body needs. Other factors like body size, muscle mass, activity level, and daily routine also make a difference. Calorie requirements by age can therefore vary from person to person. For example, someone who exercises regularly will need more calories than someone who spends most of the day sitting. Two people of the same age can also have very different calorie needs. This is why calorie intake by age, should not be based on age alone.

Energy expenditure stays fairly similar from around 20 to 60 years when differences in body size and lean mass are considered. A more noticeable decline tends to occur after the age of 60. [1]These metabolism changes with age are one of the factors to consider when looking at energy needs. This is why getting older does not automatically mean that you need to eat much less. The changes in your body and lifestyle matter too. This is an important part of understanding calorie intake by age.

Calorie Requirements in Your 20s

Your 20s can be a time when you are quite active. You may exercise regularly, walk to work or college, play sports, or simply spend more time moving around. All this movement increases the amount of energy your body uses. A person with a bigger body or more muscle may need more calories than someone with a smaller body or less muscle. There is no fixed calorie need for everyone in 20s. Your needs are better judged by looking at your activity level, body size, and goals. This can help you understand your calories needed per day. This is also a good time to build habits that can help you later in life. Regular exercise, balanced meals, and enough protein can help support muscle mass and overall health.1

Calorie Requirements in Your 30s

Turning 30 does not suddenly cause your metabolism to slow down. The bigger change for many people is their daily routine. Work can mean more time at a desk, fewer steps, and less time for exercise. Your activity may gradually decrease without you even noticing it. With less movement, the body uses fewer calories than it did before. If food intake stays the same but daily activity drops, weight gain can happen over time. So, if you notice changes in your weight during your 30s, look at your daily movement too. Hence, calorie requirements by age should also take your current activity into account.

Calorie Requirements in Your 40s

By your 40s, your body composition becomes more important when looking at calorie needs.
As we get older, we may slowly lose muscle, especially if we are not active or doing strength exercises. Simultaneously, body fat can increase. These changes can also lower the amount of energy your body uses when you are resting. This is one way how your metabolism changes with age and may affect your needs. Perhaps your routine is different than it was in your 20s. Work, family and other responsibilities can leave less time for exercise. Your calorie needs should match your current lifestyle, not the lifestyle you had ten or twenty years ago. This can also influence your calories needed per day.

Calorie Requirements in Your 50s and Beyond

As you move into your 50s and later years, changes in activity and muscle mass can become more noticeable. Energy expenditure tends to decrease more clearly after around 60 years of age. One reason is that people often have less muscle and may be less physically active. You may need fewer calories as you get older compared to when you were younger. But your body still needs the same important nutrients. Protein, vitamins, minerals, and fibre continue to be important for staying healthy. This makes food choices important. If calorie needs are lower, filling your meals with foods that provide adequate amount of essential nutrients within the calories you eat is important. This is an important part of understanding calorie intake by age.[2]

How Muscle Loss Influences Metabolism

Muscle is important when it comes to energy use. Your body needs energy to maintain muscle even when you are resting. As muscle mass decreases, your resting energy needs can also decrease. Losing muscle becomes more common as we age. Regular exercise and a healthy diet can help you maintain muscle as you get older. Strength training can help you keep your muscles strong.[3] Protein is important too. Include foods like milk, curd, eggs, fish, chicken, soy, dal, and other pulses in your diet. Considering age and metabolism can help when making these changes.

Nutrition Tips for Every Age Group

Your diet does not need to look completely different every time you enter a new decade. The focus can simply change as your needs change. Calorie Requirements by Age can vary based on these changing needs.

In your 20s: Try to build healthy eating habits early. Include protein, whole grains, vegetables, fruits, and healthy fats in your meals.

In your 30’s: Be aware of your activity levels. If you have a sedentary lifestyle, try to get more movement in your day.
In your 40s: Get a good protein source with your meals and incorporate strength training into your routine to maintain your muscles.
In your 50s: You may need fewer calories as you get older compared to when you were younger, which is an important part of understanding calorie requirements by age. Choose foods that give you good nutrients in each meal.

If you’re in your 60s and beyond: Protein is even more important to help maintain muscle. It is important to eat protein and do strength training exercises to maintain muscle mass. These habits can support your calories needed per day as your needs change. [4],[5],[6],[7]

Final Thoughts

Energy expenditure can remain stable through much of adulthood, with a clearer decline seen in later life. Looking at calorie intake by age alongside your activity and body composition can provide more context. Stay active, include enough protein, and choose foods that provide good nutrition. These simple habits can help you adjust your food intake as your body changes with age. Age and metabolism are connected, but your individual needs still depend on several other factors like muscle mass, physical activity level, etc. Metabolism changes with age can be part of the picture, but they do not determine your needs on their own.

Author: Nurture Health Solutions

Reference:

[1] Pontzer, H., Yamada, Y., Sagayama, H., Ainslie, P. N., Andersen, L. F., Anderson, L. J., Arab, L., Baddou, I., Bedu-Addo, K., Blaak, E. E., Blanc, S., Bonomi, A. G., Bouten, C. V. C., Bovet, P., Buchowski, M. S., Butte, N. F., Camps, S. G., Close, G. L., Cooper, J. A., Cooper, R., … IAEA DLW Database Consortium (2021). Daily energy expenditure through the human life course. Science (New York, N.Y.), 373(6556), 808–812. https://doi.org/10.1126/science.abe5017

[2] Siervo, M., Oggioni, C., Lara, J., Celis-Morales, C., Mathers, J. C., Battezzati, A., Leone, A., Tagliabue, A., Spadafranca, A., & Bertoli, S. (2015). Age-related changes in resting energy expenditure in normal weight, overweight and obese men and women. Maturitas, 80(4), 406–413. https://doi.org/10.1016/j.maturitas.2014.12.023

[3] González-Rocha, A., Mendez-Sanchez, L., Ortíz-Rodríguez, M. A., & Denova-Gutiérrez, E. (2022). Effect Of Exercise on Muscle Mass, Fat Mass, Bone Mass, Muscular Strength and Physical Performance in Community Dwelling Older Adults: Systematic Review and Meta-Analysis. Aging and disease, 13(5), 1421–1435. https://doi.org/10.14336/AD.2022.0215

[4] Panda, A., & Booth, S. L. (2022). Nutritional Aspects of Healthy Aging. The Medical clinics of North America, 106(5), 853–863. https://doi.org/10.1016/j.mcna.2022.04.008

[5] Campbell, W. W., Deutz, N. E. P., Volpi, E., & Apovian, C. M. (2023). Nutritional Interventions: Dietary Protein Needs and Influences on Skeletal Muscle of Older Adults. The journals of gerontology. Series A, Biological sciences and medical sciences, 78(Suppl 1), 67–72. https://doi.org/10.1093/gerona/glad038

[6] Bojang, K. P., & Manchana, V. (2023). Nutrition and Healthy Aging: A Review. Current nutrition reports, 12(3), 369–375. https://doi.org/10.1007/s13668-023-00473-0

[7] Whaikid, P., & Piaseu, N. (2024). The effectiveness of protein supplementation combined with resistance exercise programs among community-dwelling older adults with sarcopenia: a systematic review and meta-analysis. Epidemiology and health, 46, e2024030. https://doi.org/10.4178/epih.e2024030