Lasha Uchava
Endocrinologist, MD
From Excess Weight to a New Life
When a patient tells me, “I just have a little extra weight,” I always explain that this “little” often plays a crucial role in fertility.
Obesity significantly impacts both female and male fertility. Excess weight frequently causes hormonal imbalances, which complicate the conception process and increase the risk of pregnancy complications.
Modern medicine is paying closer attention to the impact of lifestyle on reproductive health. Studies confirm that Body Mass Index (BMI) is directly linked to fertility. Obesity is not merely an aesthetic issue; it is a complex endocrine condition that alters the body’s hormonal landscape and metabolic regulation.
From an endocrinological perspective, excess weight is associated with insulin resistance, hyperinsulinemia, and an imbalance of adipokines (leptin, adiponectin), which directly affects the hypothalamic-pituitary-gonadal axis and disrupts the physiological secretion of reproductive hormones.
During in vitro fertilization, the chance of a successful pregnancy in obese patients is 25% lower compared to those with an optimal weight.
How “Extra Kilograms” Alter a Woman’s Biochemical Map
Overweight and obesity significantly affect the reproductive health of both women and men, and consequently, their fertility. Today, one in six couples worldwide faces reproductive difficulties. Often, the root cause is not genetics, but our lifestyle. Obesity is not just about “extra kilograms”—it is a condition that rewrites the body’s biochemical map.
Excess adipose tissue produces an overabundance of estrogen. This leads to “hormonal chaos,” causing the body to fail at maintaining regular ovulation in the ovaries. Excess fat tissue is frequently accompanied by insulin resistance, which also degrades egg quality, though this specific problem can occur even without obesity.
Additionally, high insulin levels stimulate the excess production of androgens in the ovaries, further complicating ovulation and exacerbating hormonal imbalances. Obesity often aggravates the symptoms of PCOS (Polycystic Ovary Syndrome), one of the most common causes of infertility, and negatively affects egg quality as well as the chances of embryo implantation.
Studies show that women with a BMI exceeding 30 face a risk of infertility that is three times higher than that of women of normal weight, and they generally require more time to conceive compared to women of normal weight.
The Impact of Obesity on Male Fertility
As for men, obesity lowers testosterone levels and increases testicular temperature (due to the excess fat layer), which is detrimental to spermatozoa.
Through endocrinological mechanisms, adipose tissue enhances the aromatization of testosterone into estrogens, leading to a clinical picture of hypogonadism and a decline in spermatogenesis. Sperm motility decreases, and the risk of DNA damage increases, which ultimately compromises fertilization.
Every extra 10 kilograms reduces a man’s chance of fertility by approximately 10%. Sperm count decreases, and their morphology changes. At the same time, obesity increases the risk of developing erectile dysfunction.
Clinical Assessment and Recommendations
During an endocrinological assessment, a comprehensive analysis of metabolic and hormonal parameters is highly advisable. In practice, it is recommended to evaluate insulin resistance (HOMA-IR index), determine glycemic control (HbA1c), assess thyroid function (TSH, and free T4 if necessary), and check Vitamin D levels. Depending on the individual clinical picture, additional testing for the lipid profile, prolactin, and sex hormones may be required. Such a comprehensive approach allows for the timely detection of hidden metabolic disorders and ensures targeted treatment, significantly increasing the chances of improving reproductive outcomes.
Restoring Balance – The First Step Toward Fertility
The primary directions for management are determined based on the metabolic and hormonal disorders identified during clinical evaluation.
To boost fertility, the main goal is not strict starvation, but rather stabilizing insulin levels, reducing inflammatory processes, and achieving sustainable weight loss.
For the body to “trust” its environment and prepare for pregnancy, nutrition must be stable and nourishing. Restoring metabolic homeostasis is the very foundation upon which reproductive health stands.
Statistically, a weight loss of just 5-10% restores natural ovulation in 60% of cases and significantly improves sperm parameters. Any dietary changes should be long-term and enjoyable so that the body does not feel stressed.
Keep this in mind and make it a habit: half of your plate should always consist of vegetables, especially leafy greens, as they are rich in folic acid. One-quarter should be dedicated to protein (fish, chicken, eggs), and one-quarter to complex carbohydrates.
Drink enough water and consume berries (strawberries, blueberries, raspberries). They are rich in antioxidants that protect eggs and sperm from damage.
The fight for fertility does not mean chasing specific numbers on a scale. It means creating an environment where your body feels safe enough to begin a new life.