Testosterone Killers

After thirty, a man’s testosterone levels start to decrease, this is natural but it gets worse with high stress or a bad diet. Buy grass-fed, organic meats to avoid the chemicals such as hormones that will affect your testosterone levels.

Some people who are born male and want to be female strive to lower their testosterone levels with certain foods such as mint, flax seeds and liquorice.

So here are some foods, activities and environmental issues to avoid that are scientifically proven to lower your testosterone production or have estrogenic properties. See also a detailed list of testosterone boosting foods.

Testosterone killers


Soy is a plant that contains phytoestrogens. Soy is the most popular high-phytoestrogen food in the transgender community (M2F transitions). They mimic the same female hormone produced by women to cause the development of secondary sex characteristics. Eating too many of these phytoestrogens could disrupt hormone balance in both men and women, depressing libido across the board. High levels of soy are found in soy milk, edamame, tofu snacks and most vegetarian meat alternatives. Most soy worldwide is GMO and it is incredibly cheap (most of the world's soybeans are consumed indirectly by humans through products such as the cheap meats, chicken, pork and beef, dairy, eggs and farmed fish). Feminized men have earned the nickname "soy boys" because men on high soy diets have way less testosterone and lower sperm counts (high estrogen level in men are almost always a direct route to low testosterone levels). The soy industry worldwide is a multi-billion dollar industry, so the pro-soy lobby is very strong. SOYJOY® is one of the leading sponsors of AND (Academy of Nutrition and Dietetics), which is a powerful agency that promotes soy. So the science is rather split. Soy contains isoflavones (genistein, daidzein and glycitein) which act as phytoestrogens (plant estrogens) in the human body. They are similar to the female hormone, estrogen, and are believed to have similar effects in the body, although the bodies receptors treat them differently. Other studies put it down to isoflavones in soy being digested in the gut. You can read about "male-to-female transition website promoting soy here, here, here and here.  Make your own mind up! We think there is a big risk with soy and male feminization, if you have young male babies or boys then don't give them soy milk and other soy garbage.

  • Soya Beans

Being Obese Or Overweight

The easiest way to get into high estrogen problems as a male, is to eat your way into obesity. You don’t even need to reach obesity status, as for every gained fat pound, your aromatase enzyme activity increases and this leads to higher rate of testosterone being converted to estrogen. As your body weight goes up, testosterone drops and estrogen increases. Since estrogen increases subcutaneous fat gain, this will eventually create a vicious cycle where increased fat mass boosts estrogen and higher estrogen increases fat. You can lose weight very quickly with fasting.

  • Fat Bastard

Bad Milk & Dairy

Estrogen hormones can be thousands of times more estrogenic than typical endocrine-disrupting chemicals. Food exposure to natural sex steroids (in meat, dairy, and eggs) is a huge concern. It doesn’t matter if it ends up in our drinking supply or cows excreting it into their milk. Our day-to-day estrogen exposure levels are more likely determined by whether or not we happen to eat dairy products that day. Estrogen and other hormones are fat soluble and they concentrate in the milk and meat of animals fed cheap artificial feeds (particularly soy which is packed with phytoestrogens). Such feeds are mostly GMO and the animals are often pumped with growth hormones and antibiotics. Try and stick to non-GMO organic dairy.

  • Diary

A Low Fat Diet

Fat contains cholesterol, which your body converts to steroidal hormones. This includes testosterone as well as estrogen. A diet in which less than 20% of the calories come from fat limits your  production of testosterone. You should consume healthy fats and enough fats to maintain hormone production. A diet high in MUFAs and SFAs, but low in PUFAs will promote testosterone production. eg swapping corn oil for virgin olive oil.  MUFA = Monunsaturated fatty acids. SFA = Saturated fatty acids. PUFA = Polyunsaturated fatty acids.

  • Low Cal

Excessive Alcohol

Ethanol in beer or any other alcoholic beverage will slow down the P45 enzyme system in the liver allowing estrogen to stay in your system much longer, the more estrogen, in general, the less testosterone. Alcohol is a depressant that can play havoc with a man’s ability to achieve and maintain an erection and dampen libido for both sexes. Alcohol causes some oxidative damage in the testicular leydig cells and various other bodily tissues, which leads to local reduction of testosterone inside the ballsack, and also to the destruction of some testosterone molecules in circulation, due to the effects of the stress hormone cortisol. Very high alcohol consumption significantly increases estrogen levels. This is due to the fact that it boosts the activity of the aromatase enzyme, which works by converting testosterone into the female sex hormone estrogen. Here is a list of good to bad types of alcohol:  1. Red wine (The best),  2. White wine & Champagne,  3. Vodka,  4. Gin,  5. Rum,  6. Whiskey,  7. Sweet mixed drinks,  8. Liqueurs, 9. Beer (The worst).  The hops in most types of beer have estrogen-like properties and can adversely affect testosterone.

  • Beer

Hot showers and Hot Baths

Cold showers could be the answer. Why do your balls hang in a sack and why does the sack lengthen when it's hot and shrink when it is cold?  Your testes love being a little colder than the rest of your body and thousands of years of evolution have created the perfect position for them. The theory of cooling your balls for increased testosterone production has been around the bodybuilding scene for decades now. According to a scientific study, human testes perform at their best when they’re around 31-36 °C (87-96 °F). anything hotter than that will negatively impact DNA synthesis, spermatogenesis and most likely also testosterone production. So tight underwear and thick jeans are a no-no. So wear a kilt or get some loose boxers! When sat at home or on the computer, ditch the trousers and lower the AC. Fat thighs and an overhanging belly will also insulate the little fellas from the cold.

  • Hot

Lack of Exercise

Low testosterone levels in the bloodstream of a man are often caused by unhealthy lifestyle decisions and habits. Firstly, a lack of exercise directly contributes to a reduced production of this vital sex hormone in the male body. A sedentary lifestyle has been linked to many other health effects as well, including heart disease, diabetes, and even colon cancer. The best exercise for testosterone levels is fast but brief cardio, which includes high-intensity interval training (HIIT). 

  • No exercise

Eating Constantly

When your blood, liver and muscles can't hold any more glucose/glycogen, your body will start to metabolise the glycogen into fatty acids and stored fat.  The quickest way to gain fat is to be inactive AND keep your body topped up with sugary foods and simple carbs all day long....  you will never deplete your glycogen stores and start tapping into fat reserves. Grazing all day will keep your insulin levels spiked all the time, this will lead to insulin dependency and pre-diabetes. Your body is not designed to graze all day like a cow. You should start fasting and intermittent fasting where you will have periods without food.

  • Constant


You should think twice about smearing a chemical concoction into you skin. Sunscreens and UV lipbalms are filled with chemicals that act as reproductive inhibitors. There are endocrine inhibiting chemical such as benzophenones, 4-Methylbenzylidene camphor, parabens, octyl-dimethyl-PABA and octyl-methoxycinnamate and homosolate. Try and buy baby sunscreens as they are more likely to contain fewer chemicals. Some organic sunscreen contain zinc which is a super testosterone booster when absorbed.  

  • quorn


Quorn was originally described as a mushroom protein and is derived from a fungus or mould called Fusarium venenatum. It is sold to vegetarians as a meat substitute.  Myco-estrogens are estrogens produced by certain fungi and mold and are structurally similar to estrogen. They have similar testosterone lowering effects inside the body.

  • quorn

Mosquito Repellants

You could be lowering your testosterone levels every time you apply mosquito spray. Many of the older repellents were actually banned because of the fact that they were strong antiandrogens when in contact with human body, directly blocking the conversion from cholesterol into testosterone. Newer sprays and fumigants mostly use a chemical called chlorpyrifos which breaks down  into TCPY inside the body. TCPY significantly lowers circulating testosterone levels in healthy adult men. Citronella based sprays are the best option.

  • Mosquito

Eating Processed Sugars

Limit simple sugars from your diet.  The major internal organs, glands, and muscles all use glucose as their main energy source. If you deprive the body from this, it will try to make up for it by a process called gluconeogenesis, in which the body breaks down protein and fatty-acid to create glucose, do this long enough and your body goes into ketosis (The Keto diet). Almost all carbohydrates, starches and sugars, break down to glucose (the simplest form of sugar) after ingestion. Glucose is the simplest form of sugar and the main energy provider of the cells in the body. Fructose is found naturally in fruits and honey and is metabolized in the liver instead of the gut. Sucrose is table sugar (50% fructose and 50% glucose)  extracted from sugar beets or sugar cane.  Sucrose occurs naturally in vegetables and fruit. Lactose (milk sugar) is found in milk and dairy products. There’s also maltose, which is found in malted drinks and beer. Eating simple sugars is bad because it doesn’t contain any any micronutrients. It’s far better to get your glucose and fructose from testosterone boosting foods. The other issue is that there is a tendency to graze all day on sugary foods, your body is getting constant insulin spikes which will lead to insulin dependency.

  • Sugar

Eating Processed Meals

Burgers, hot dogs and many microwave meals are some of the worst offenders. They use low grade meat and get processed with high chemical content that can lower testosterone. Also the low nutrient to calories ratio is also a disaster because you will become full whilst not receiving vital micro-nutrients. French fries and other fried foods are loaded with trans fats and PUFAs (Polyunsaturated fatty acids). They’re also highly addictive which leads to weight gain and lower testosterone levels. PUFAs are liquid in room-temperature but contain multiple double carbon-carbon bonds (soybean oil, canola oil, sunflower seed oil, cottonseed oil, margarine, etc), higher PUFA results in higher SHBG (which binds to testosterone) and makes testosterone less bioavailable.

  • Processed

Cheap Cheese

Cheap cheese has negative effects similar to milk and other dairy products from factory farmed livestock. They are also more likely to have many additives and preservatives. Cheap cheese will lack the broad vitamin and mineral profile that organic cheeses or fermented cheeses have, for instance vitamin K2.

  • Cheese

Prolonged Period Of Stress

When the body is subjected to stress it releases a hormone called cortisol which is a testosterone killer (it does this through an enzyme that affects testosterone in the Leydig cells of the testes).  When cortisol is elevated, it takes the raw building material of testosterone and makes the stress hormone, rather than male sex hormone.  Scientific studies have found out that vitamin C taken after exercise rapidly clears cortisol and enhances recovery. Higher cortisol levels are  also associated with increased insulin resistance and elevated blood glucose levels.

  • Cortisol and Stress


The main compound in licorice is glycyrrhizic acid, which gives licorice root its distinctive flavour. It can suppress testosterone production. Glycyrrhizin has both mineralocorticoid properties and glucocorticoid properties in the body, similar to steroids. In one study, male subjects were given licorice each day, four days into the study, testosterone levels had decreased by 35 percent (ouch!). Licorice is a firm favourite as a food to help men who want to become women. Sambuca warning.... White Sambuca's flavour is dominated by anise, elderberries, and sugar. Black Sambuca's flavor is dominated by witch elder bush and licorice. 

  • Licorice

Bottled Water (Plastic)

The water isn’t the culprit here; it’s the plastic bottle. Bisphenol A, commonly referred to as BPA, is a chemical component found in most plastic food containers and cans and is associated with negative impacts on fertility in both men and women. A Slovenian study in the journal Fertility & Sterility found a statistically significant association between urinary BPA concentration in men and lower total sperm count, concentration and vitality. Women with the highest BPA levels in the body produced 27 percent less viable eggs when tested during a study out of Harvard School of Public Health.

  • Plastic Water Bottles

Flax Seeds

Flaxseed are very high in phytoestrogens and are a great source of healthy fats. They are very popular with guys who want to transition to a lady (become transgender). Flax contains lignans which highly estrogenic. They reduce total and free testosterone levels and also suppress the enzyme 5-a reductase which converts testosterone into its more potent form of dihydrotestosterone (DHT). Lignans work by increasing the levels of SHBG (sex hormone binding globulin), which binds to free-testosterone molecule.

  • Flax


Many of the herbs from the mint family have testosterone reducing effects. These include spearmint and peppermint.  It is though that mint reduced the levels of free testosterone in the body. Spearmint has been used as a treatment for women with high androgen levels who have excessive facial hair. Peppermint tea is also promoted in the transgender M2F community as a natural way to feminize. So think twice about ordering a Mojito guys!

  • Mint

Plastic Containers

Endocrine disrupting chemicals that can leech out from plastic  containers, cooking utensils, microwave-food packaging etc. Many of these chemicals have been identified as xenoestrogens and antiandrogens, meaning that they are structurally similar to estrogen causing feminizing effects, and suppressing testosterone production. Bisphenol A (BPA) and phthlates are two estrogenic compounds found in many common plastic bottles and containers, both have been linked to increased estrogen and lower testosterone & DHT in several human and animal trials. When plastic is heated, says Scientific American, it leaches chemicals 50 times faster than normal. So, never ever heat food in a plastic container in the microwave, or pour hot food (especially liquid) into a plastic container. Even if it says “microwave safe” on it, it's still going to leach chemicals.

  • Plastic containers

Edamame Beans

Edamame is the Japanese name for fresh, baby soybeans still in the pod. They are  full of good nutrients like fibre, calcium, protein, and vitamin A. However THEY ARE SOY and are packed with phytoestrogens. Organic (non GMO) Edamame might be borderline good, however it's not really worth the risk when there are many healthier no-testosterone lowering alternative out there.

  • Edamame Beans

Bad Underwear

This is linked to temperature (testicles have been designed by mother nature be cooler that body temperature) and the best option is to go for thin micro-mesh underwear (not the high-fashion thick cotton rich designs). Definitely go commando whilst sleeping and keep the duvet tog to a minimum! The cooler a mans balls are on average, conditions will be better for testosterone production..

  • Underwear

Zinc Deficiency

Zinc reduces the frequency of illness and supports optimal levels of testosterone. In high doses, zinc can act as an aromatase inhibitor and reduce estrogen levels. It is also a potent antioxidant and can provide benefits for prostate issues. Zinc is lost through sweating, so you need to get a lot of zinc through correct foods.

  • Zinc

Vitamin D Deficiency

Vitamin D occurs naturally in fish and eggs. But the best way to get it is through regular sun exposure.  Low vitamin D  is associated with low free testosterone and increased bone fracture risk. Men with low vitamin D levels are much more likely to have low testosterone levels when compared to men with adequate amounts of the vitamin.

  • Vitamin D