5 Hormones That Hold in Fat — And How to Fix Them

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Hormones are effectively chemical messengers that travel throughout your body coordinating complex processes such as growth, metabolism, and fertility. They are made by your endocrine glands — thyroid, pancreatic islets, adrenals, ovaries, and pituitary — and can influence your immune system, growth, metabolism, and behavior.

Research has also discovered a relationship between these hormones and fat storage in different areas of the body. Having too much of one hormone could predispose you to store fat on your stomach, upper arms, or thighs.

"As children, boys' and girls' bodies are both straight up and down," says women's health expert Marilyn Glenville, PhD. "But at puberty, levels of male and female hormones rise and dictate body shape. Some experts believe a range of other hormones, if they're out of balance, can also impact where you store fat." Luckily, there are steps you can take to make changes to your shape by tailoring your diet and lifestyle.

The Problem: Flabby Arms

The Hormone: Testosterone

"Testosterone isn't exclusively a male hormone," says Max Tomlinson, naturopath and author of Target Your Fat Spots ($9.85, Amazon). "Women produce small amounts in their adrenal glands and ovaries, and it's thought to contribute to muscle and bone strength, brain function, and libido."

If you don't have enough, you may accumulate fat on the backs of your upper arms. "Men don't have bingo wings because higher testosterone helps them create lean arms," says Tomlinson.

A woman in her 40s typically has just half the testosterone she had in her 20s, he explains. "After menopause, testosterone can drop dramatically. You may also notice fatigue and a low sex drive."

"High blood glucose decreases testosterone production, so keep levels in check by cutting sugar and refined carbs," advises Tomlinson. Swap bread and pasta for whole wheat versions and avoid sugary foods.

The Problem: A Big Bum

The Hormone: Estrogen

"This female hormone drives the storage of fat around the hips and thighs in women of childbearing age, so it's natural to have a pear shape," says Dr. Glenville. "But it is possible to have too much estrogen. Along with more fat on the hips and thighs, heavy periods can be a sign. Having large breasts can also be an indicator, as breast growth is driven by this hormone."

These chemicals act as "endocrine disruptors," causing unwanted chemical changes in your body. Some bind to hormone receptor cells and send false signals, while others block the action of the natural hormone, stopping it from binding to its receptor and having its intended effect.

"It's hard to avoid these chemicals completely, but choosing organic foods and avoiding packaged, processed foods will help reduce your exposure," says Glenville.

If it's not possible to eat an entirely organic diet, the US' Environmental Working Group advises you to at least choose organic soft berries and salad leaves, as non-organic versions more easily absorb pesticides and preservatives used than food with a tough skin, which you can remove, such as bananas and avocados.

One way to maintain an efficient bowel is to take probiotics, as studies have shown they decrease transit time of food in the gut. "They will help balance levels of friendly bacteria in your gut, improving your digestion," says Glenville.

"Increasing fiber intake could help," she adds. "Try porridge for breakfast, as oats are high in soluble fiber, which is more soothing on your digestive system than cereal grains such as bran."

She also recommends flaxseed as it absorbs water and forms a soothing gel-like substance to aid the passage of stools. Soak a teaspoon of seeds in water overnight and drink the mixture the next morning, when it has turned into a jelly.

A word of caution: Some gastroenterologists have advised people with IBS not to increase fiber as they say it can worsen symptoms.

The Problem: Pot Belly

The Hormone: Cortisol

"Cortisol is released under stress," says Glenville. "It releases sugar into the bloodstream, readying us to run or fight, activities which would use up the sugar. But nowadays, we're under chronic, low-level stress from sitting in traffic jams or fielding lots of emails. This means cortisol is constantly being released, leading to consistently raised blood sugar.

"The sugar has to be stored somewhere, and because the presence of cortisol makes the body think a threat is present, it stores it as fat around the middle of the body, where it can be accessed quickly." The other problem is when you're stressed, you're more likely to reach for sugary snacks in a bid to raise your energy. This reinforces the problem, as the blood sugar roller-coaster can further exacerbate stress.

The Problem: Muffin Top

The Hormone: Insulin

The job of insulin is to move glucose from the bloodstream into your body's cells to be used as fuel. Excess glucose is stored as glycogen in your liver cells. 

"Insulin levels rise as we get older, particularly if your diet is high in refined carbohydrates, and this can lead to more fat storage around the hips," says Tomlinson. High insulin levels can result in insulin resistance, when your body's cells can't use the hormone effectively. 

"Women with polycystic ovary syndrome (PCOS) are insulin resistant and that's why it's associated with having a muffin top," says Glenville. Over time, insulin resistance can raise your risk of type 2 diabetes.

The Problem: Bra Bulge

The Hormone: Thyroid Hormones

Situated in the neck, the thyroid gland secretes the hormones triiodothyronine (T3) and thyroxine (T4), which control how quickly your body burns calories and uses energy. "It's hard to lose weight anywhere if your thyroid is under-active, but my female clients with low thyroid function very often have fat deposits under the armpits," says Tomlinson.

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This article was originally written by Now to Love editors. For more, check out our sister site, Now to Love.

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