Here is a summary of the most important topics discussed in the sources: The Problem of Infertility in Poland: More than one and a half million people in Poland are struggling with infertility, and the number is steadily growing . Impact of Low-Fat Dairy on Female Fertility: Consuming five to six servings of low-fat dairy products per week increases the risk of anovulation (lack of ovulation) by 86% . Anovulation is the cause of infertility in a given menstrual cycle . Mechanism of Action of Low-Fat Dairy: It is hypothesized that the removal of fat from milk disrupts the composition of hormones and molecules, for example, increasing the concentration of IGF1 (insulin-like growth factor), which negatively affects the hypothalamic-pituitary-ovarian axis . Antidote - Fatty Dairy: Women trying to have children are advised to consume dairy from the other side of the pole, that is, fatty dairy (such as 3.2% milk or fat yogurt) . One glass of full-fat milk or one serving of fatty yogurt per day has the opposite effect, increasing fertility . Fertility Diet (Harvard, 2007): This diet, which included high-fat dairy products instead of fat-free products, showed women suffering from ovulatory infertility had a 66% lower risk of this type of infertility . Other elements of this diet include less trans fats, more monounsaturated fats (e.g., olive oil), less animal protein, more plant protein, and more products rich in fiber and low-glycemic index carbohydrates . Harmful Effects of Trans Fats: Consumption of just 4 grams of trans fats per day can increase the risk of ovulatory infertility in women by 73% and reduce the total sperm count in men by 49% . Mechanism of Harm of Trans Fats: Trans fats build into the cell membranes of reproductive cells, which reduces their flexibility and impedes the transport of hormones, interfering with the maturation of egg cells . The amount of Trans Fats in the Daily Diet : Reaching the threshold of 4 grams is easy because these fats are hidden in popular products . Examples of amounts of products containing about 4g of trans fats are: 6 to 10 pieces of cookies/biscuits, 200 to 500g of fast food fries (fried in old oil), or 2-3 donuts/3-4 croissants . Removing Trans Fats from the Body: The most effective way is to get rid of them completely from the diet, which allows 6 to 24 months to remove them from the body . This process can be accelerated by consuming omega-3 fish fatty acids and omega-9 fatty acids (such as oleic acid from olive oil), which displace trans fats from human cells. One study showed that the proportion of trans fatty acids in erythrocytes decreased by 23%