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Body weight has a direct effect on hormones, ovulation, sperm quality, and IVF success. Here is why doctors recommend reaching a healthy weight before trying to conceive — and how to do it safely.
How Weight Affects Fertility
Body fat plays an active role in hormone production. Excess weight can disrupt the balance of oestrogen, insulin, and other hormones needed for regular ovulation — while being significantly underweight can stop ovulation altogether. For men, excess weight lowers testosterone and reduces sperm count and quality.
Why Doctors Recommend Losing Weight Before Conceiving
Restores regular ovulation: Even a 5–10% reduction in body weight can restart ovulation in women with PCOS.
Improves IVF response: Women at a healthy weight typically respond better to ovarian stimulation and need lower doses of medication.
Better embryo quality and implantation: Excess weight is associated with lower egg quality and reduced implantation rates.
Safer pregnancy: A healthy pre-pregnancy weight lowers the risk of gestational diabetes, high blood pressure, and pregnancy complications.
Improves male fertility: Weight loss in men improves testosterone levels and sperm parameters.
How to Lose Weight Safely When Planning a Pregnancy
Aim for gradual loss — about 0.5 kg per week; crash dieting can itself disrupt ovulation
Prioritise whole foods: vegetables, lean protein, whole grains, and healthy fats
Reduce refined sugar and processed food, which worsen insulin resistance
Exercise moderately: 30–45 minutes of walking, swimming, or yoga most days
Get 7–8 hours of sleep — poor sleep affects hunger and fertility hormones
Avoid extreme fasting or very low-calorie diets without medical supervision
When Weight Loss Alone Isn't Enough
If you have been trying to conceive for a year (or six months if over 35) despite a healthy weight, or if you have PCOS, thyroid issues, or irregular cycles, a fertility evaluation is the right next step.
Support from Iswarya Fertility
Iswarya Fertility's specialists assess how weight and metabolic health are affecting your fertility and guide you on a realistic plan — alongside any treatment you may need. Call or WhatsApp 99627-00000 to book a consultation.
Frequently Asked Questions
Does weight affect fertility?
Yes. Excess weight disrupts hormone balance and ovulation in women and lowers sperm quality in men. Being significantly underweight can also stop ovulation.
How much weight do I need to lose to improve fertility?
Even a 5–10% reduction in body weight can restore regular ovulation, particularly in women with PCOS.
Does losing weight improve IVF success?
Women at a healthy weight generally respond better to ovarian stimulation, produce better-quality eggs, and have higher implantation rates.
Is it safe to diet while trying to conceive?
Gradual weight loss through a balanced diet and moderate exercise is safe. Crash diets or extreme fasting should be avoided, as they can disrupt ovulation.