Study finds long-term tea consuming considerably elevated sperm focus
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In a current research revealed in Chemosphere, researchers investigated the affiliation of tea consumption with semen high quality.

Study: Association between tea consumption and semen high quality amongst 1385 wholesome Chinese males. Image Credit: Cast Of Thousands/Shutterstock


Tea is probably the most consumed beverage worldwide, with a worldwide plantation protection of 4.89 million hectares. China is the biggest tea producer, accounting for about 45% of world manufacturing. One report revealed that the Chinese inhabitants consumed greater than 2.2 million tons of tea. Moreover, opposite to the predominant consumption of tea by older adults, present developments indicated that younger and middle-aged individuals too most popular tea.

Studies have recognized over 500 completely different chemical substances, together with tea polyphenols, carbohydrates, amino acids, proteins, risky compounds, and different unknown compounds. Fresh tea leaves are enriched with polyphenols often called catechins which represent practically 30% of the dry weight of leaves. Several organic properties have been attributed to tea polyphenols, together with antimicrobial, antioxidant, anti-inflammatory, anti-atherosclerotic, and anti-cancer.

Mounting proof means that tea consumption is related to protecting results towards cancers, diabetes, neurological problems, and cardiovascular ailments (CVDs). Nonetheless, restricted research investigated the consequences of tea on reproductive well being.

About the research

Researchers within the present observational research assessed the affiliation between tea consumption and semen high quality in Chinese males. Eligible topics had been Chinese nationals aged 22-45-years who volunteered for semen donation and had been wholesome with none systemic illness, sexually transmitted ailments (STDs), genetic illness(s), or familial historical past of genetic ailments. Participants accomplished a questionary and a bodily examination and supplied semen samples to the Human Sperm Bank in Hubei Province.

Samples had been examined by three skilled personnel, and inside high quality management ensured that intra- and inter-day variations had been beneath 10%. Semen specimens met the next standards for donation – 1) liquefaction time of contemporary samples ought to be lower than 60 minutes with a sperm focus of 60 million/ ml or increased. 2) Progressive motility ought to be 60% or increased with a standard morphology above 30%. 3) After thawing, the motility of semen ought to be 40% or larger, with 12 million sperms per vial. 4) The freeze-thaw survival charge ought to be 60% or increased.

Trained interviewers administered questionnaires to acquire baseline traits like sociodemographic parameters and way of life habits. Tea consumption, period, and frequency of tea consumption over the previous three months had been evaluated. Participants had been categorized into tea drinkers and non-tea drinkers. Student’s t-test and chi-squared check had been carried out for steady and categorical variables, respectively.


Overall, 1,385 contributors supplied 6,466 samples. Most contributors supplied not less than two samples. The imply age of tea drinkers was 29.2 years, with a imply body-mass index (BMI) of 23.4 kg/m2. More than half of tea drinkers had been people who smoke (55%) and occasional alcohol drinkers (56%).

Based on the crude evaluation, tea drinkers exhibited barely higher semen focus and sperm rely, however sperm motility was decrease than non-tea drinkers. Consumers of inexperienced tea confirmed marginally higher sperm motility in comparison with non-tea drinkers. After adjusting for confounders, the workforce noticed that those that consumed tea prior to now ten years exhibited the very best focus of sperms.

Tea consumption for ten years or longer considerably elevated sperm focus by 16.27% relative to non-drinkers. Moreover, the associations between tea consumption and semen high quality had been stratified by BMI, smoking, and alcohol habits. They discovered a constructive affiliation between these consuming tea for the final ten years and semen high quality amongst underweight (BMI < 18.5 kg/m2) and regular weight (18.5 – 24 kg/m2) contributors.

There was no clear relationship between semen high quality and smoking amongst tea drinkers apart from increased semen quantity in people who smoke. Sperm focus was increased if tea consumption was frequent (three days every week) amongst occasional alcohol customers. Drinking tea for no less than three days every week was positively related to progressive sperm motility. This affiliation was evident solely in occasional alcohol customers.


Tea consumption for ten years or longer was considerably related to larger sperm concentrations. Sperm concentrations had been additionally considerably increased in tea drinkers with a low or regular BMI. Besides, if tea was consumed for 3 or extra days every week, increased sperm rely and progressive motility had been noticed amongst those that sometimes consumed alcoholic drinks.

Former people who smoke had increased semen quantity, whereas present people who smoke had decrease quantity than non-smokers. Given that the research inhabitants consisted of wholesome and younger individuals, these outcomes won’t be generalized. These findings revealed that tea consumption improved semen high quality in males and that the protecting impact of tea on male fertility or reproductive well being must be investigated sooner or later. 

Journal reference:

  • Liu, X. et al. (2022) “Association between tea consumption and semen quality among 1385 healthy Chinese men”, Chemosphere, 303, p. 135140. doi: 10.1016/j.chemosphere.2022.135140.

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