News | Nutrition and Fertility: How Carbohydrates, Protein, and Fatty Acids May Affect Infertility
Female infertility has received increasing attention in recent years. New research suggests that nutrition, a modifiable risk factor, may significantly affect female fertility and in vitro fertilization (IVF) outcomes. The study highlights the roles of carbohydrates, protein, and fatty acids and calls for further research.
Nutrition and female fertility: Rising infertility rates
According to the World Health Organization, about 15%-20% of couples worldwide experience infertility. As rates rise, more studies are examining whether lifestyle and dietary changes can improve fertility. Research suggests that dietary patterns such as Mediterranean and Western diets, as well as particular foods, may significantly affect female infertility.
A recent study in Reproductive Toxicology examined the complex relationship between nutrition and female fertility, focusing on carbohydrates, protein, and fatty acids.
Effects of carbohydrates
Carbohydrates are the body's main energy source and may affect female fertility through glucose metabolism and insulin-mediated blood sugar control. Diets with a high glycemic index (GI) and glycemic load (GL) may adversely affect ovarian function. In contrast, complex carbohydrates such as soluble fiber and whole grains can lower glycemic load and may improve pregnancy and live-birth rates.
Data from the Nurses' Health Study II indicated that women with higher carbohydrate intake had about an 80% greater risk of ovulatory infertility than those with lower intake. A calorie-restricted diet with carbohydrates below 45% may improve polycystic ovary syndrome (PCOS) symptoms, increase follicle-stimulating hormone (FSH) and sex hormone-binding globulin (SHBG), lower testosterone and insulin, and support weight loss in patients with overweight or obesity and PCOS.
Role of protein
Animal-protein intake was positively associated with ovulatory disorders, while plant protein was associated with lower risk. Replacing animal protein with plant protein for 5% of energy intake reduced the risk of ovulatory disorders by more than 50%.
Soy and dairy intake were also associated with better IVF outcomes. Soy contains phytoestrogens, isoflavones structurally similar to estrogen that have mild estrogenic effects through estrogen receptors and may support female fertility.
Effects of fatty acids
Omega-3 and omega-6 polyunsaturated fatty acids (PUFAs) are common dietary fats. Omega-3 PUFAs occur mainly in salmon, mackerel, sardines, tuna, nuts, seeds, and vegetable oils; omega-6 PUFAs are common in poultry, fish, eggs, nuts, and seeds.
Although evidence about their effects on IVF remains inconclusive, higher omega-3 PUFA intake may be associated with a greater chance of pregnancy. Some foods may also increase exposure to persistent organic pollutants: fish may contain methylmercury or dioxins, while fruits and vegetables may carry pesticide residues. Risk may depend on intake, ethnic background, and hormonal status.
Implications and future directions
Despite progress in research on nutrition and female fertility, current data are insufficient for definitive clinical dietary recommendations. Researchers call for further study of nutrition, endocrine-disrupting chemicals, and their effects on reproductive function.
The findings offer useful clues about improving female fertility, but more evidence is needed to guide dietary recommendations for couples experiencing infertility.
News | Nutrition and Fertility: How Carbohydrates, Protein, and Fatty Acids May Affect Infertility
News | Nutrition and Fertility: How Carbohydrates, Protein, and Fatty Acids May Affect Infertility
Female infertility has received increasing attention in recent years. New research suggests that nutrition, a modifiable risk factor, may significantly affect female fertility and in vitro fertilization (IVF) outcomes. The study highlights the roles of carbohydrates, protein, and fatty acids and calls for further research.
Nutrition and female fertility: Rising infertility rates
According to the World Health Organization, about 15%-20% of couples worldwide experience infertility. As rates rise, more studies are examining whether lifestyle and dietary changes can improve fertility. Research suggests that dietary patterns such as Mediterranean and Western diets, as well as particular foods, may significantly affect female infertility.
A recent study in Reproductive Toxicology examined the complex relationship between nutrition and female fertility, focusing on carbohydrates, protein, and fatty acids.
Effects of carbohydrates
Carbohydrates are the body's main energy source and may affect female fertility through glucose metabolism and insulin-mediated blood sugar control. Diets with a high glycemic index (GI) and glycemic load (GL) may adversely affect ovarian function. In contrast, complex carbohydrates such as soluble fiber and whole grains can lower glycemic load and may improve pregnancy and live-birth rates.
Data from the Nurses' Health Study II indicated that women with higher carbohydrate intake had about an 80% greater risk of ovulatory infertility than those with lower intake. A calorie-restricted diet with carbohydrates below 45% may improve polycystic ovary syndrome (PCOS) symptoms, increase follicle-stimulating hormone (FSH) and sex hormone-binding globulin (SHBG), lower testosterone and insulin, and support weight loss in patients with overweight or obesity and PCOS.
Role of protein
Animal-protein intake was positively associated with ovulatory disorders, while plant protein was associated with lower risk. Replacing animal protein with plant protein for 5% of energy intake reduced the risk of ovulatory disorders by more than 50%.
Soy and dairy intake were also associated with better IVF outcomes. Soy contains phytoestrogens, isoflavones structurally similar to estrogen that have mild estrogenic effects through estrogen receptors and may support female fertility.
Effects of fatty acids
Omega-3 and omega-6 polyunsaturated fatty acids (PUFAs) are common dietary fats. Omega-3 PUFAs occur mainly in salmon, mackerel, sardines, tuna, nuts, seeds, and vegetable oils; omega-6 PUFAs are common in poultry, fish, eggs, nuts, and seeds.
Although evidence about their effects on IVF remains inconclusive, higher omega-3 PUFA intake may be associated with a greater chance of pregnancy. Some foods may also increase exposure to persistent organic pollutants: fish may contain methylmercury or dioxins, while fruits and vegetables may carry pesticide residues. Risk may depend on intake, ethnic background, and hormonal status.
Implications and future directions
Despite progress in research on nutrition and female fertility, current data are insufficient for definitive clinical dietary recommendations. Researchers call for further study of nutrition, endocrine-disrupting chemicals, and their effects on reproductive function.
The findings offer useful clues about improving female fertility, but more evidence is needed to guide dietary recommendations for couples experiencing infertility.
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Compiled from online sources