Why is losing weight so difficult after forty?

Losing weight after forty is less successful because the body changes on multiple fronts at the same time: metabolism slows down, hormone levels shift, and muscle mass gradually decreases. These are biological processes that occur independently of willpower or effort. The good news is that understanding these mechanisms helps to work towards weight loss in a more targeted and realistic way. This article answers the most frequently asked questions about weight loss after 40.

What changes in your body around your forties?

Around the age of forty, several physiological changes take place simultaneously that make the body less efficient at burning calories. Muscle mass decreases, body fat percentage increases, and the metabolism slows down. These changes are gradual but cumulative, and they reinforce one another.

One of the most drastic shifts is the loss of muscle mass, also known as sarcopenia. Muscle tissue burns more calories at rest than fat tissue. When muscle mass decreases, the basal metabolic rate also drops, which is the number of calories the body burns without any activity. This means that someone who eats the same at forty as they did at twenty-five will gradually gain weight without any change in behaviour.

Additionally, fat distribution changes. Fat is more often stored around the abdomen instead of on the hips or thighs. Belly fat, also known as visceral fat, is more metabolically active and is linked to a higher risk of health problems. This makes weight loss after 40 not only a matter of aesthetics, but also of health.

How do hormones affect your weight after the age of forty?

Hormones play a central role in weight regulation, and after the age of forty, multiple hormone levels change simultaneously. In women, oestrogen levels drop in the lead-up to the menopause, which leads to increased fat storage around the abdomen. In men, testosterone levels decline gradually, which affects muscle mass and fat burning.

Alongside sex hormones, the levels of insulin, cortisol and leptin also change. Insulin sensitivity decreases with age, meaning the body handles carbohydrates less efficiently. Cortisol, the stress hormone, has a direct influence on fat storage in the abdominal region. People with busy lives and chronic stress are therefore at extra risk of weight gain around the waist.

Leptin, the hormone that signals satiety, works less effectively in overweight people. This phenomenon, leptin resistance, ensures that the feeling of hunger persists, even after consuming enough food. This makes losing weight after forty extra challenging, because the body actively resists weight loss via hormonal signals.

Why don't diets that used to work work anymore?

Diets that worked in your twenties or thirties are less effective after forty because the body has fundamentally changed. A lower basal metabolic rate means that the same calorie reduction has less effect. Furthermore, the body adapts more quickly to calorie restriction, causing weight loss to stall sooner.

Another mechanism is that long-term or repeated dieting can further slow down the metabolism. The body interprets a calorie deficit as a threat and adjusts its energy expenditure to protect its reserves. This is also known as the yo-yo effect: after each diet, it is harder to lose weight and easier to put it back on.

Furthermore, the composition of the gut microbiome changes with age, which affects how nutrients are absorbed and processed. What someone could eat without any problem at a younger age without gaining weight can have a different effect on weight after forty. This explains why an approach that used to work now yields insufficient results.

What is the difference between normal fatigue and a slow metabolism?

Normal fatigue usually has a clear cause such as sleep deprivation, stress or overexertion, and disappears after recovery. A sluggish metabolism is a structural change in how the body processes energy, and is accompanied by persistent weight gain despite unchanged eating habits, constant fatigue and difficulty losing weight.

Symptoms that may indicate a slowed metabolism include: weight gain without a change in diet, feeling cold all the time, dry skin, hair loss and a persistently low energy level. Some of these complaints overlap with thyroid problems, which is a medical condition that must be diagnosed by a doctor.

It is important not to diagnose yourself. Anyone who suspects that an underactive thyroid or another hormonal cause is behind their weight gain would be wise to discuss this with a doctor. Only a blood test can provide certainty about thyroid function and other hormone levels.

When is medical guidance for weight loss useful?

Medical supervision during weight loss is useful when someone achieves no results despite persistent effort, when the weight poses health risks, or when there is a BMI above 30. In such cases, a doctor can assess whether there are underlying causes and whether medical support is appropriate.

Not everyone who wants to lose weight needs medical supervision. However, for people in whom lifestyle changes have insufficient effect, a doctor can outline additional options. This involves looking at the individual situation: health history, medication use, weight and any conditions that make weight loss more difficult.

Medical guidance also offers structure and accountability. People who are supervised by a doctor stick to their journey better than those who try alone. This is not a sign of weakness, but an acknowledgement that weight loss after forty is a more complex process than simply eating less.

How does GLP-1 medication work for weight loss after forty?

GLP-1 medication works by mimicking a hormone that occurs naturally in the body and plays a role in regulating appetite and blood sugar. It slows down stomach emptying, increases the feeling of fullness and lowers appetite. This can contribute to weight loss, particularly in people for whom other methods have insufficient results.

After the age of forty, GLP-1 medication can be extra relevant, because it interferes with the hormonal mechanisms that make weight loss difficult. It reduces the hunger signals that are disrupted in leptin resistance, and helps keep blood sugar levels more stable, which can reduce overeating caused by energy slumps.

GLP-1 medication is not a quick fix and no replacement for lifestyle change. Results vary per person and the medication is only prescribed after a medical assessment. Not everyone is eligible. A doctor weighs up the individual situation before a treatment is started.

How Wellumo helps with weight loss after forty

Wellumo offers medical guidance for people who want to work on weight loss, even when previous attempts did not yield the desired result. The programme is entirely online and is supervised by Dutch-registered (BIG) doctors who assess on a case-by-case basis whether treatment is appropriate and responsible.

Here is how the process works at Wellumo:

• You fill in a medical questionnaire via the online intake, so that a doctor can assess your situation
• A BIG-registered physician independently assesses the application and determines whether a treatment is medically justified
• Upon approval, a prescription will be drawn up and sent to the cooperating pharmacy.
• Medication is delivered discreetly to your home, with the option of a subscription for repeat deliveries
• Prices are communicated transparently in advance, with no hidden costs

Not everyone is eligible for treatment. The doctor always decides independently based on the medical situation. Do you want to know how the trajectory works or do you have any questions before you start an intake? Then take contact Wellumo or start the online questionnaire straight away to have it assessed which options might be suitable for you.