Healthy eating: why teenagers overeat and older people binge

While young people can eat anything they can lay their eyes on, older people often have a reduced appetite. Knowing why is important to staying healthy at any age.

“Our body tells us more or less what to eat and when, and maybe we should listen to it,” said lead researcher Susanne Klaus of the German Institute of Human Nutrition.

This is true. But the way our body demands energy from us is not the same throughout our life.

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From being spoon-fed by parents during infancy to sneaking in sweet desserts during childhood, eating everything in adolescence and then eating anything from small, simple plates in the later stages of life, our appetite changes as time goes by. Understanding why can help ensure good health in our later years.

Appetite hormones and how they work

Essentially, eating food is functional: without the energy it provides, we could not survive.

Carbohydrates in our food are converted into energy, while fats and amino acids help build important proteins and other structures that help the body function.

To keep these processes running regularly, the body has special systems to ensure a regular energy supply.

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“in [are self-regulating] “The mechanisms that drive hunger and satiety are complex,” Kloss said. “They receive signals primarily from the stomach and intestine, but also from hormones such as leptin, which is secreted by adipose tissue. [or body fat] and that signals the main hypothalamus [a control center in the brain]It’s an autonomous system, like breathing.”

These chemical factors that compel us to seek out (or stop seeking out) food are sometimes called hunger hormones. Besides leptin, ghrelin is probably the best-known hunger hormone.

Ghrelin is released by the stomach into the bloodstream and tells the brain to eat. When your stomach is full, the release of ghrelin slows down, leading to a feeling of fullness.

Other hormones also control the feeling of fullness and emptiness. These include insulin and other pancreatic hormones that suppress hunger, such as GLP-1, which the diabetes drug Ozempic mimics.

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Digestive Mechanism

When these hormones prompt you to put food into your mouth, the body uses digestive processes to, literally, eat your food.

Mechanical digestion begins in your mouth, where you grind up your food into smaller, softer forms that you can swallow. This process continues until the swallowed slurry moves down the esophagus into your stomach — a process known as peristalsis.

Chemical digestion also occurs simultaneously with this process. It begins in the mouth, where amylase enzymes in saliva begin to break down the starches in food. Most of these digestive enzymes are then returned to the stomach to finish the job so that water and nutrients can be absorbed from the intestines into the bloodstream.

How your appetite changes as you age

This impulse for food increases greatly when a person reaches adolescence. The body seeks energy to fuel its most important growth phase – puberty – which leads to physical and sexual maturity.

But nutrition throughout life can be a challenge. For older people, there is a risk of the body becoming less effective at stimulating the necessary intake of nutrients. Some studies have shown changes in hunger hormone secretion patterns in later life.

“When people get older on average, [they] “Muscle mass decreases, and muscle is the part that uses the most energy,” Klaus said.

One of the main reasons for loss of muscle mass is not consuming enough protein.

“According to various scientific groups, protein intake in late life is below recommended amounts, and even recommendations should be higher, because maintaining muscle mass is so important,” said Daniel Crabtree, a late-life nutrition researcher at the University of Aberdeen.

Despite the advice, Crabtree said protein intake among older people is typically lower than recommended, and this can include physiological factors and other symptoms of an aging body — from dental problems to changes in taste or smell.