- Nutrient Needs in Young Adulthood
- Nutrient Needs in Middle Age
- Preventative nutrition to ward off disease
- Changes that occur in the body during menopause
Adulthood begins at the end of adolescents and continues until the end of one’s life. During adulthood, the human body will reach maximum cardiac output, specifically between ages twenty and thirty. Bone and muscle mass also reach optimal levels, and physical activity improves muscle strength, endurance, and tone. Along with physical activity, nutrition also plays an essential role in maintaining health through adulthood. As you’ve already learned, a healthful diet includes a variety of nutrient-dense foods. Consuming diets high in fruits and vegetables offers health benefits such as a reduced risk for heart disease and protection against certain cancers.
Energy and Macronutrients
Young men typically have higher nutrient needs than young women. Women’s energy requirements are 1,800 to 2,400 calories, and 2,400 to 3,000 calories for men, depending on activity level, for ages nineteen to thirty. These estimates do not include women who are pregnant or breastfeeding, who require a higher energy intake. For carbohydrates, the AMDR is 45 to 65 percent of daily calories. All adults, young and old, should eat fewer energy-dense carbohydrates, especially refined, sugar-dense sources, particularly for those who lead a more sedentary lifestyle. The AMDR for protein is 10 to 35 percent of total daily calories and should include a variety of lean meat and poultry, eggs, beans, peas, nuts, and seeds. The guidelines also recommend that adults eat two 4-ounce servings (or one 8-ounce serving) of seafood per week.
It is also important to replace proteins high in trans fats and saturated fat with lower amounts of solid fats and calories. All adults should limit total fat to 20 to 35 percent of their daily calories and keep saturated fatty acids to less than 10 percent of total calories by replacing them with monounsaturated and polyunsaturated fatty acids. Avoid trans fats by limiting foods that contain synthetic sources, such as partially hydrogenated oils. The AMDR for fiber is 22 to 28 grams per day for women and 28 to 34 grams per day. Soluble fiber may help improve cholesterol and blood sugar levels, while insoluble fiber can help prevent constipation.
Micronutrient needs in adults differ slightly according to sex. Young men and women who are very athletic and perspire a great deal also require extra sodium, potassium, and magnesium. Males require more vitamins C and K, along with thiamine, riboflavin, and niacin. Females require extra iron due to menstruation. Therefore, it can be beneficial for some young adults to follow a daily multivitamin regimen to help meet nutrient needs. But as always, it is important to remember “food first, supplements second.
Middle age is defined as the period from age thirty-one to fifty. The early period of this stage is very different from the end. For example, many women experience pregnancy, childbirth, and lactation during the early years of middle age. In the latter part of this life stage, women face perimenopause, which is a transition period that leads up to menopause, or the end of menstruation. Several physical changes occur in the middle-aged years, including the loss of bone mass in women due to dropping estrogen levels during menopause. In both men and women, visual acuity declines, and by age forty, there can be a decreased ability to see objects at a close distance, a condition known as presbyopia. During this stage of the human life cycle, adults begin to experience the first outward signs of aging. Wrinkles begin to appear, joints ache after a highly active day, and body fat accumulates. There is also a loss of muscle tone and elasticity in the connective tissue. In their late thirties and their forties, many people notice a decline in endurance, the onset of wear-and-tear injuries (such as osteoarthritis), and changes in the digestive system. Wounds and other injuries also take longer to heal. Body composition changes due to fat deposits in the trunk. To maintain health and wellness during the middle-aged years and beyond, it is important to:
- maintain a healthy body weight
- consume nutrient-dense foods
- drink alcohol in moderation
- don’t smoke
- engage in moderate physical activity at least 150 minutes per week
Energy and Macronutrients
The energy requirements for ages thirty-one to fifty are 1,800 to 2,200 calories for women and 2,200 to 3,000 calories for men, depending on activity level. These estimates do not include women who are pregnant or breastfeeding. Middle-aged adults must rely on healthy food sources to meet these needs. In many parts of North America, typical dietary patterns do not match the recommended guidelines. Following the middle-aged years, ‘ dietary guidelines provide adequate but not excessive energy, macronutrients, vitamins, and minerals.
The AMDRs for carbohydrates, protein, fat, fiber, and fluids remain the same from young adulthood into middle age. It is important to avoid putting on excess pounds to help avoid cardiovascular disease, diabetes, and other chronic conditions.
There are some differences, however, regarding micronutrients. For men, magnesium’s recommendation increases to 420 milligrams daily, while middle-aged women should increase their magnesium intake to 320 milligrams per day. Other key vitamins needed during the middle-aged years include folate and vitamins B6 and B12 to prevent elevation of homocysteine, a byproduct of metabolism that can damage arterial walls and lead to atherosclerosis, a cardiovascular condition. Again, it is important to meet nutrient needs with food first, then supplementation, such as a daily multivitamin, if you can’t meet your needs through food.
During the middle-aged years, preventive nutrition can promote wellness and help organ systems to function optimally throughout aging. Preventive nutrition is defined as dietary practices directed toward reducing disease and promoting health and well-being. Healthy eating in general—such as eating unrefined carbohydrates instead of refined carbohydrates and avoiding trans fats and saturated fats—promotes wellness. However, there are also some things that people can do to target specific concerns. One example is consuming foods high in antioxidants, such as strawberries, blueberries, and other colorful fruits and vegetables, reducing cancer risk.
Phytochemicals are also great nonessential nutrients that may promote body wellness. For example, carotenoids, which are found in carrots, cantaloupes, sweet potatoes, and butternut squash, may protect against cardiovascular disease by preventing the oxidation of cholesterol in the arteries. According to the American Cancer Society, some studies suggest that a phytochemical found in watermelons and tomatoes called lycopene may protect against stomach, lung, and prostate cancer, although more research is needed.
Omega-3 fatty acids can help to prevent coronary artery disease. These crucial nutrients are found in oily fish, including salmon, mackerel, tuna, herring, cod, and halibut. Other beneficial fats vital for healthy functioning include monounsaturated fats, which are found in plant oils, avocados, peanuts, and pecans.
In the middle-aged years, women undergo a specific change that has a major effect on their health. They begin the process of menopause, typically in their late forties or early fifties. The ovaries slowly cease to produce estrogen and progesterone, which results at the end of menstruation. Menopausal symptoms can vary but often include hot flashes, night sweats, and mood changes. The hormonal changes that occur during menopause can lead to many physiological changes, including alterations in body composition, such as weight gain in the abdominal area. Bone loss is another common condition related to menopause due to the loss of female reproductive hormones. Bone thinning increases the risk of fractures, affecting mobility and the ability to complete everyday tasks, such as cooking, bathing, and dressing.
Recommendations for women experiencing menopause or perimenopause (the stage just before the end of the menstruation) include:
- consuming a variety of whole grains and other nutrient-dense foods
- maintaining a diet high in fiber, low in fat, and low in sodium
- avoiding caffeine, spicy foods, and alcohol to help prevent hot flashes
- eating foods rich in calcium, or taking physician-prescribed calcium supplements and vitamin D
- incorporating stretching exercises to improve balance and flexibility and reduce the risk of falls and fractures
Obesity remains a major concern in young adulthood. A BMI above 25 is considered overweight for adults, and a BMI of 30 or higher is obese. By that measurement, about two-thirds of all adults in the United States are overweight or obese, with 35.7 percent considered obese. During childhood and adolescence, physical inactivity and poor dietary choices are major contributors to obesity in adulthood. Therefore, it is important to limit unrefined carbohydrates and processed foods.
- Summerize nutrient requirements during young adulthood. (MCCCD Competency 4)
- Summerize nutrient requirements during middle age. MCCCD Competency 4)
- Identify changes that take place in the body during young adulthood and middle age. (MCCCD Competency 4)
- Discuss menopause and summarize how to ease menopausal symptoms. (MCCCD Competency 9)
- Explain how obesity impacts health during young adulthood and middle age. (MCCCD Competency 9)