プロテインサプリ

• 英バーミンガム大学の調査によれば、体づくりのためにプロテインサプリメントを摂取している男性の多くが、このサプリが生殖機能に悪影響を及ぼす可能性について認識していないことが明らかになった。

• プロテインサプリには、女性ホルモンであるエストロゲンが高用量含まれており、過剰摂取が男性の精子の量や質に問題を引き起こす可能性がある。

• 調査によれば、ジムに通う男性の約79％がフィットネス計画の一環としてプロテインサプリを摂取しており、その影響について考えたことがあるのはわずか14％であった。

• プロテインサプリに含まれるアナボリックステロイドは、生殖機能に影響を及ぼす可能性があり、これを意図せず摂取している男性も存在する可能性が指摘されている。

• ジム通いやプロテインサプリの使用目的として最も多かったのは筋肉増強であり、生殖機能への影響について考えたことがある男性は全体の14％にとどまった。

• バーミンガム大学の研究者は、男性が生殖機能について自発的に考えない背景には、社会が依然としてこれを「女性の問題」と見なし、男性の生殖機能が生涯にわたって変化しないとの誤解が影響している可能性があると指摘している。

• 世界保健機関によれば、世界で6人に1人が不妊症の問題を抱えており、男性にもその要因があるにも関わらず、これに対する認識が不足していると述べられている。

• 研究者は、この結果が体づくりや運動を否定するものではなく、摂取するサプリについての理解を深める必要があると強調している。

• A study by Meurig Gallagher and colleagues at the University of Birmingham reveals that many men taking protein supplements for bodybuilding may be unaware of the potential negative impact on reproductive function. These supplements often contain high doses of estrogen, a female hormone that may affect reproductive function. Despite this, approximately 79% of men attending gyms, as part of their fitness plans, consume supplements such as whey protein and soy protein. Only 14% of men have considered the potential effects of protein supplements on reproductive function.

• According to Gallagher, excessive intake of female hormones could potentially cause issues with the quantity and quality of sperm in men. Moreover, many commercially available protein supplements contain anabolic steroids. This suggests that men using protein supplements may unknowingly be administering steroids to themselves. Anabolic steroids can lead to various problems, including a decrease in sperm count, testicular shrinkage, and erectile dysfunction.

• The study, based on responses from 153 individuals (71 men, 82 women, aged 18-25), utilized an online survey to explore the relationship between factors related to gym attendance and male reproductive function. Among these individuals, 79% of men (56 individuals) and 56% of women (46 individuals) have used or are currently using protein supplements. The most common purpose cited by supplement users was muscle enhancement (95% of men, 65% of women), followed by nutritional supplementation (41% of men, 37% of women).

• While 52% of men acknowledged having thought about their reproductive function, only 14% had considered the potential impact of gym attendance or protein supplement intake on male reproductive function. Additionally, 28% of men agreed that the benefits derived from going to the gym or using protein supplements were more important than their potential impact on reproductive function. Meanwhile, 38% disagreed with this statement. Notably, 75% of men recognized that the use of anabolic steroids could affect reproductive function, but only 11% were aware of the potential harm from protein supplement intake.

• Co-author Jackson Brown, a professor of reproductive biology at the University of Birmingham, suggests that the results indicate men tend to show interest in their reproductive function if prompted but don't spontaneously consider it. He attributes this to the broader societal perception of reproductive function as a 'women's issue' and the misunderstanding that male reproductive function remains unchanged throughout life.

• Brown emphasizes that the study results should not be interpreted as a reason for individuals engaged in bodybuilding to quit going to the gym. Instead, he highlights the importance of individuals educating themselves about the supplements they consume, be it protein or vitamin supplements.

• According to Gallagher, half of infertility cases worldwide are related to male factors, a fact that is often insufficiently recognized. The World Health Organization (WHO) estimates that one in six couples worldwide is affected by infertility, underscoring the growing concern for this issue.