The speed that your body burns energy for its everyday functions is called your metabolic rate. For most people, this doesn't start to slow down until around the age of 60, but it does change if your weight changes.
Your metabolic rate peaks in your early 20s, according to Women's Health Magazine. At this age, you tend to have a higher muscle mass and have a fair amount of physical activity built into your day. As early as age 30, however, men and women begin noticing a dip in their ability to lose weight.
Why does metabolic rate slow down for women? Over time, studies have shown that metabolic rate (how fast we burn calories) starts to slow down by 2 to 3 percent each decade, beginning in our 20s. It becomes more noticeable between ages 40 and 60.
Why Does Metabolism Slow Down as You Age? Loss of muscle mass. As you age, you naturally lose muscle mass. As a result, you burn calories at a lower rate.
As we age, our metabolism slows and the rate at which we break down food decreases by 10 percent each decade after age 20. Metabolism is the amount of energy (calories) your body uses to maintain itself.
Epidemiologists have observed that the average person typically puts on 1 to 2 pounds a year from early adulthood through middle age. The CDC's numbers show that much of the increase is concentrated in the 20s, for men and women.
Your Metabolism Is Slower Than Before
Having more fat and less muscle reduces calorie burning. Many people also become less active with age for various reasons, which further slows the number of calories you burn.
“In your 20s, the main culprit to weight gain is stress, which causes high cortisol, one of your body's key fat-storage hormones,” says Dr. Sara Gottfried, bestselling author of “The Hormone Cure” and “The Hormone Reset Diet.” Cortisol, a hormone released in response to stress, can wreak havoc on our bodies, she adds.
A slow metabolism has many symptoms, and you're likely to have one if you find it difficult to lose weight and easy to gain weight. Other symptoms include fatigue, poor digestion, constipation, low mood, and a colder than average body temperature. All of these are caused by the lower production of energy and heat.
If you don't eat enough, your metabolism switches to slow-mo. Severe diets, especially when you also exercise, teach your body to make do with fewer calories. That can backfire, because your body clings to those calories, which makes it harder to take weight off.
After age 30, people tend to lose lean tissue. Your muscles, liver, kidney, and other organs may lose some of their cells. This process of muscle loss is called atrophy. Bones may lose some of their minerals and become less dense (a condition called osteopenia in the early stages and osteoporosis in the later stages).
Typically from the age of 40, testosterone levels drop. As testosterone is responsible for regulating fat distribution, muscle strength and muscle mass, less testosterone can make it harder to burn calories. Both men and women produce less growth hormone from middle age, another hormone involved in regulating body fat.
No matter what your age, you can improve your fitness.
If it's been a long time since you've exercised and you're feeling less than fit, you might think that it's too late to make a change. But you're wrong. You can improve your fitness at any age.
Losing weight in your 30s may be more challenging than when you were younger, but it's not impossible. It's important to have patience and make mindful, nutritious choices. This includes eating a balanced diet, getting enough sleep, drinking plenty of water, and making sure to get your body moving.
The typical fat-gain areas for many women are the hips, arms and thighs, giving them what is termed a 'pear-shape'. The other areas where many women accumulate fat are the chest and the abdomen. Such women have slim arms and legs, and are seen as 'apple-shaped'. They also might have a family history of diabetes.
Muscle is denser than fat, and as it is more compact within your body, as you gain muscle mass, you end up looking thinner, no matter your physical weight. So, if you've been doing a lot of strength training lately, it's likely this is the reason that you're looking fantastic but not dropping those numbers.
Obesity most commonly begins between the ages of 5 and 6, or during adolescence. Studies have shown that a child who is obese between the ages of 10 and 13 has an 80 percent chance of becoming an obese adult.
Physical activity: Walking, chasing after your kids, playing tennis and other forms of exercise cause your body to burn more calories than being sedentary. Smoking: Nicotine speeds up your metabolism, so you burn more calories. This is one reason people who quit smoking may put on weight.
Thus, water drinking provides a sympathetic stimulus, which increases the metabolic rate, i.e, thermogenesis, which in turn augments the daily energy expenditure.