Many women feel frustrated when they notice stubborn tummy fat that seems difficult to lose, even when they are trying to eat well.

But belly fat rarely develops because of one single cause.

In most cases, abdominal fat is influenced by a combination of lifestyle, biological, hormonal and environmental factors.

Understanding these causes is important because it allows women to address the real drivers of belly fat, rather than simply trying another restrictive diet.

For many women over 35, factors like hormonal shifts, sleep quality, stress levels, gut health and muscle mass play a much bigger role than they realise.

Here are some of the most common reasons belly fat can gradually increase.

1. Overeating without realising

One of the most common contributors to belly fat is simply consuming more calories than the body needs, often without being aware of it.

This does not always happen through large meals. Instead, it can occur through:

• frequent snacking
• larger portion sizes
• extra cooking oils
• sugary drinks or smoothies
• finishing children’s leftovers

These small extras can add hundreds of additional calories per day, which over time may lead to fat storage around the abdomen.

2. Ultra-Processed Foods

Ultra-processed foods are designed to be highly palatable and easy to overeat.

These foods often contain:

• refined carbohydrates
• added sugars
• unhealthy fats
• artificial ingredients
• very little fibre

Because they are low in protein and fibre, they are less satisfying and can lead to increased hunger and overeating.

Research has consistently shown that diets high in ultra-processed foods are linked to higher levels of abdominal fat and inflammation.

3. Alcohol and belly fat

Alcohol can be a hidden contributor to tummy fat for several reasons.

Firstly, alcohol contains empty calories, meaning it provides energy without essential nutrients.

Secondly, when alcohol is consumed, the body prioritises processing alcohol instead of burning fat, which may increase fat storage.

Alcohol can also:

• increase appetite
• reduce food inhibitions
• disrupt sleep quality

Over time, this combination can encourage fat accumulation around the abdomen, sometimes referred to as “beer belly” — although it can affect women just as much as men.

4. Sugar and refined carbohydrates

High intake of added sugars and refined carbohydrates can contribute to belly fat by affecting blood sugar regulation.

Foods that cause rapid blood sugar spikes include:

• sugary drinks
• desserts
• white bread
• pastries
• highly refined snacks

When blood sugar rises quickly, the body releases insulin, a hormone that helps move sugar into cells.

Frequent spikes in insulin may encourage the body to store excess energy as fat, particularly around the abdomen.

5. Poor Sleep

Sleep plays a powerful role in regulating metabolism and appetite.

When sleep is disrupted or insufficient, it can alter key hunger hormones:

• ghrelin, which increases hunger
• leptin, which signals fullness

Lack of sleep can therefore lead to:

• stronger cravings for high-energy foods
• increased appetite
• reduced energy for exercise

Over time, poor sleep has been linked to increased belly fat and weight gain.

6. Chronic stress

Stress is another major factor that can contribute to abdominal fat.

When the body experiences chronic stress, it releases higher levels of cortisol, often called the stress hormone.

Elevated cortisol levels may:

• increase appetite
• promote cravings for sugary foods
• encourage fat storage around the abdomen

This is why stress is often associated with stubborn midsection weight gain.

7. Insulin resistance

Insulin resistance occurs when the body becomes less responsive to insulin, making it harder for cells to absorb glucose from the bloodstream.

As a result, the body may produce higher levels of insulin, which can encourage fat storage.

Insulin resistance is strongly linked to abdominal fat accumulation, and it can develop gradually over time due to:

• high sugar intake
• sedentary lifestyle
• poor sleep
• chronic stress

8. Hormonal Changes

Hormones play a major role in where the body stores fat.

For women, changes in oestrogen and progesterone levels during perimenopause and menopause can influence fat distribution.

Lower oestrogen levels may encourage the body to store more fat around the abdomen instead of the hips and thighs, which many women notice during midlife.

9. Muscle loss with age

As people age, they naturally begin to lose lean muscle mass, a process known as sarcopenia.

Muscle tissue burns more calories than fat, even when the body is at rest.

This means that when muscle mass decreases, metabolism may slow down, making it easier to gain fat if diet and activity levels remain the same.

Strength training and adequate protein intake are key strategies for maintaining muscle mass.

10. Sedentary lifestyle

Modern lifestyles often involve long periods of sitting.

Many people spend hours each day:

• working at desks
• driving
• watching screens

This reduces overall daily energy expenditure, which may contribute to fat gain over time.

Even small increases in daily movement can make a difference.

11. Gut health imbalances

The gut microbiome - the trillions of bacteria living in the digestive system — plays a role in metabolism, digestion and appetite regulation.

Poor gut health may contribute to:

• bloating and digestive discomfort
• increased inflammation
• altered hunger signals

Emerging research suggests that gut imbalances may influence weight regulation and fat storage.

Supporting gut health with fibre-rich foods, fermented foods and diverse plant foods can be beneficial.

Many women also see incredible results with bloating after using the GUT formula

12. Emotional eating

Food is often used as a way to cope with emotions such as:

• stress
• boredom
• sadness
• fatigue

This type of eating is usually driven by emotions rather than physical hunger.

When emotional eating becomes frequent, it can lead to extra calorie intake and gradual fat gain, often around the abdomen.

13. Genetics

Genetics also play a role in body composition.

Some people are naturally more likely to store fat around the abdomen, while others store it around the hips or thighs.

Although genetics influence this tendency, lifestyle habits still play a significant role in overall health and body composition.

Age-related changes in metabolism

As people get older, several changes occur in the body that can influence fat storage.

These include:

• slower metabolism
• hormonal changes
• reduced muscle mass
• changes in physical activity levels

This combination can make maintaining a healthy weight more challenging, particularly around the midsection.

However, focusing on nutrition, movement, sleep and stress management can still have a powerful impact.

The key takeaway

Tummy fat rarely develops because of just one habit or behaviour.

Instead, it is usually the result of multiple factors working together, including:

• diet quality
• sleep patterns
• stress levels
• hormonal changes
• physical activity
• gut health

Understanding these influences allows women to move away from extreme dieting and instead focus on sustainable lifestyle habits that support overall health.

Small, consistent improvements in daily habits can have a powerful effect on energy levels, metabolic health and body composition over time.

You can also join the Zing Wellbeing program here