Complete Guide to Diet Precautions for IVF in China: Reproductive Doctors Explain Nutrition Plans for Ovulation Induction and Embryo Transfer

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Author ｜ Reproductive Medicine Center · Patient Education Group
Reviewer ｜ Department of Reproductive Endocrinology, Department of Clinical Nutrition

Opening: Patient Misconceptions

In outpatient clinics, we often encounter a type of patient: those who drink five or six cups of soy milk every day after egg retrieval, those who completely avoid any so-called "trigger foods" after embryo transfer, or those who spend a lot of money on various imported health supplements while paying no attention to their basic dietary structure. Behind these practices is a common misconception—believing that diet can "directly" determine embryo implantation or egg quality. In reality, diet cannot directly alter genetic material or the embryonic development program, but it indirectly provides a better growth environment for the embryo by influencing metabolic environment, hormonal balance, oxidative stress levels, and immune status. Understanding this is the first step to establishing an effective dietary strategy.

I. Core Principles of the IVF Diet

Although the focus differs at different stages (ovulation induction, after egg retrieval, before transfer, after transfer, recurrent failure), the underlying logic is consistent: balanced, anti-inflammatory, antioxidant, and low glycemic load.

• Balanced: A reasonable ratio of macronutrients (carbohydrates, protein, fat) and adequate micronutrients (vitamins, minerals). No single food can provide all nutrients.
• Anti-inflammatory: Reduce pro-inflammatory foods (refined sugar, trans fatty acids, ultra-processed foods) and increase anti-inflammatory foods (dark-colored vegetables, berries, turmeric, sources of omega-3 fatty acids like deep-sea fish and flaxseeds).
• Antioxidant: Supplement with antioxidants (Vitamin C, Vitamin E, Coenzyme Q10, selenium, zinc) to reduce oxidative damage to egg and sperm DNA. An antioxidant-rich diet is one of the non-pharmaceutical means to improve egg quality.
• Low Glycemic Load: Choose low-GI staple foods (whole grains, legumes, tubers) paired with adequate dietary fiber to stabilize postprandial blood sugar and insulin levels. A high-insulin environment can interfere with follicular development and endometrial receptivity.

II. Why Diet Affects IVF Outcomes

Diet affects assisted reproductive outcomes through the following four pathways. Understanding these mechanisms helps avoid "blind food avoidance" or "blind supplementation."

• Egg Quality and Oxidative Stress: The antioxidant capacity in follicular fluid is closely related to egg maturity and fertilization rate. A high-fat, high-sugar diet exacerbates oxidative stress, while an antioxidant-rich dietary pattern (such as the Mediterranean diet) can reduce reactive oxygen species levels, protecting the egg's spindle structure and mitochondrial function.
• Endometrial Receptivity and Insulin Resistance: Insulin resistance leads to abnormal endometrial glucose metabolism and reduced blood supply, decreasing the ability to accept an embryo. A low-carbohydrate, high-fiber diet helps improve insulin sensitivity, thereby improving endometrial status.
• Hormone Metabolism and Gut Microbiota: The gut microbiota participates in the enterohepatic circulation of estrogen. A high-fiber diet promotes the growth of beneficial bacteria, helping maintain appropriate estrogen levels. Dysbiosis can cause abnormal estrogen levels, affecting follicular development and endometrial growth.
• Immune Status and Chronic Inflammation: Chronic low-grade inflammation is one of the independent risk factors for recurrent implantation failure. Omega-3 fatty acids and polyphenolic compounds have anti-inflammatory effects, while trans fatty acids and refined sugar activate inflammatory pathways.

III. The Doctor's Perspective: Holistic View of Diet

From a reproductive doctor's perspective, dietary adjustment is part of adjunctive therapy, but not a decisive factor. Doctors focus more on the following four aspects:

• Baseline Metabolic Status: Whether indicators such as blood sugar, insulin, thyroid function, Vitamin D levels, and homocysteine are within the appropriate range. When these indicators are abnormal, dietary adjustment is a fundamental intervention.
• Presence of Dietary Issues Requiring Targeted Adjustment: Such as celiac disease, gluten intolerance, lactose intolerance, food allergies, etc. These issues may affect embryo implantation through chronic inflammation or autoimmune mechanisms.
• Weight and Body Fat Percentage: Both BMI < 18.5 and BMI > 28 are negatively correlated with IVF outcomes. Underweight individuals need to increase intake of healthy fats and protein, while overweight individuals need to control total calories and increase the proportion of dietary fiber.
• Use of Supplements and Herbal Medicine: Some supplements (e.g., high-dose Vitamin A, certain herbal medicines) may interfere with endocrine function or have embryotoxic effects. Doctors recommend developing an individualized plan after nutritional assessment, rather than self-combining.

IV. Most Easily Overlooked Details

In clinical nutritional assessments, the following five details are often overlooked by patients but have a clear impact on IVF outcomes:

• Water Intake: Dehydration can thicken cervical mucus and reduce endometrial blood supply. It is recommended to drink 1.5–2 liters of water per day (excluding sugary drinks and coffee), in small amounts throughout the day.
• Blood Sugar Stability: Sharp postprandial blood sugar fluctuations stimulate insulin and IGF-1 secretion, interfering with follicular development and endometrial growth. Eat three regular meals a day, each containing high-quality protein and dietary fiber, and avoid consuming refined carbohydrates alone.
• Gut Health: The gut microbiota influences reproductive function through the "gut-ovary axis" and "gut-uterus axis." Fermented foods (unsweetened yogurt, kimchi, natto) and soluble dietary fiber (oats, chia seeds, apples) help maintain microbial diversity.
• Trace Element Reserves: Trace elements such as selenium, zinc, iodine, and copper are essential for egg maturation and early embryonic development. Shellfish, sea fish, nuts, and animal liver are good sources, but be mindful of heavy metal risks and choose reliable sources.
• Food Intolerance: Some patients have intolerances to gluten, lactose, histamine, etc., which may cause chronic inflammatory reactions affecting endometrial receptivity. If accompanied by symptoms like bloating, diarrhea, rash, or fatigue, consider food intolerance testing.

V. Most Common Pitfalls

The following are dietary misconceptions frequently encountered in clinical practice, which are not only unhelpful but may even reduce IVF success rates:

• Blind Protein Powder Supplementation: Excessive protein (>1.8g/kg body weight/day) increases kidney burden and raises blood ammonia levels, potentially hindering embryo implantation. Unless there is severe hypoalbuminemia, protein should be obtained primarily from food (fish, eggs, milk, soy products).
• Excessive Carbohydrate Restriction: Completely eliminating staple foods can lead to energy deficiency and elevated cortisol, suppressing gonadotropin secretion and affecting follicular development. At least 120–150g of quality carbohydrates (mainly whole grains, tubers, legumes) should be consumed daily.
• Misuse of Herbal Medicine or Folk Remedies: Some herbal medicines have estrogen-like effects (e.g., kudzu root, psoralea) or uterine-contracting effects (e.g., safflower, motherwort), which may interfere with endocrine function or increase miscarriage risk. Consult a reproductive doctor before using any herbal medicine.
• Complete Lack of Dietary Restraint: Completely indulging in diet after transfer, consuming large amounts of raw/cold foods (sashimi, iced drinks), spicy foods (chili, Sichuan pepper), alcohol, or caffeine (>200mg/day), may induce uterine contractions, affect endometrial blood supply, or cause diarrhea and dehydration.
• Over-reliance on Supplements: Supplements cannot replace a balanced diet. Excessive supplementation of fat-soluble vitamins (A, D, E, K) carries a risk of accumulation toxicity; high doses of Vitamin C (>1000mg/day) may cause diarrhea and oxalate stones.

VI. Key Examination Indicators and Dietary Adjustments

Before formulating a dietary plan, it is recommended to complete the following tests and make individualized adjustments based on the results:

VII. Answers to Frequently Asked Questions

The following questions recur in patient education and are addressed one by one:

Q1: Can I eat crab after embryo transfer?

Judgmental Answer: Crab itself does not directly cause miscarriage, but it is considered a "cold" food and can easily cause allergies or diarrhea. It is recommended to avoid it for 1–2 weeks after transfer to reduce uncertain risks. If you have always eaten it without any discomfort, a small amount (no more than 1 crab per serving) is usually fine.

Q2: Should I drink soy milk?

Conditional Answer: Soy milk contains soy isoflavones, which have weak estrogenic activity. Moderate consumption (200–300ml daily) may be beneficial for patients with a thin endometrium (<7mm); patients with a normal or thick endometrium (>12mm) do not need to deliberately drink it. Those with hypothyroidism should note that soy can affect the absorption of levothyroxine; take medication at least 4 hours apart.

Q3: Do I need to eat bird's nest?

Definitive Answer: The main components of bird's nest are sialic acid and protein, and its nutritional value is not superior to eggs, milk, or fish. There is currently no high-quality evidence that bird's nest can improve IVF success rates or egg quality. It is not recommended to blindly pursue expensive supplements, especially those of unknown origin or with heavy metal contamination.

Q4: What is the best food to eat during ovulation induction?

Procedural Answer: The goal during the ovulation induction phase is to support the synchronous development of multiple follicles, requiring adequate energy and nutrients. Recommendations: ① High-quality protein (fish, shrimp, eggs, soy products) one palm-sized portion per meal; ② High dietary fiber (vegetables, whole grains) to help stabilize blood sugar; ③ Antioxidant foods (berries, tomatoes, nuts) one serving daily; ④ Coenzyme Q10 200–300 mg/day, Vitamin D 1000–2000 IU/day (based on blood levels). Also avoid high-sugar foods, fried foods, and alcohol.

Q5: Do I need to adjust my diet for recurrent failure?

Conditional Answer: Yes. Patients with recurrent implantation failure (RIF) should be systematically screened for the following factors: insulin resistance, Vitamin D deficiency, chronic endometritis, antiphospholipid syndrome, elevated homocysteine, etc. Dietary adjustments targeting these causes (e.g., low-GI diet, anti-inflammatory diet, supplementing specific nutrients) may improve outcomes in subsequent cycles. It is recommended to do so under the joint guidance of a reproductive immunology clinic and a clinical nutrition department.

VIII. Practitioner Observations

In long-term patient follow-ups, we have noted the following dietary patterns associated with better IVF outcomes:

• Mediterranean Diet Pattern: Using olive oil as the main fat source, consuming deep-sea fish at least twice a week, and eating adequate amounts of vegetables, fruits, whole grains, and nuts daily. This pattern is rich in antioxidants, omega-3 fatty acids, and dietary fiber, helping to improve egg quality and endometrial receptivity.
• Diversified Dietary Structure: Consuming more than 30 types of ingredients per week, without picky eating or relying on a few "superfoods." A diversified diet helps cover all micronutrients and avoids single nutrient deficiencies.
• Regular Meals, No Binge Eating: Regular meal times help maintain hormonal rhythms and blood sugar stability. Binge eating (especially high-carb, high-fat meals) causes fluctuations in insulin and cortisol, which is detrimental to follicular development and endometrial preparation.

Conversely, the following patterns are more common in patients with recurrent failure:

• Monotonous dietary structure (long-term consumption of only a few types of food, e.g., staple food + a small amount of vegetables, lacking high-quality protein and healthy fats)
• High reliance on takeout and processed foods (high sodium, high sugar, high trans fatty acids, low dietary fiber and micronutrients)
• Frequent dieting or fasting (energy deficiency leading to elevated cortisol, suppressing reproductive axis function)
• High consumption of sugary drinks (>500ml daily, associated with insulin resistance and chronic inflammation)

Ending: Doctor's Advice

Doctor's Advice

Dietary adjustments should be maintained throughout the entire IVF cycle, but do not expect "miracle foods" to work wonders. The most important thing is to establish a long-term healthy dietary pattern, maintain an appropriate weight (BMI 20–24), and keep metabolic indicators such as blood sugar, insulin, and Vitamin D within the ideal range. Before starting any dietary plan or nutrient supplementation, it is recommended to complete basic tests (complete blood count, liver and kidney function, blood sugar, insulin, Vitamin D, folic acid, homocysteine, thyroid function) and develop a targeted plan based on individual circumstances. IVF is the result of multiple interacting factors; diet is one aspect that can be actively optimized, but it needs to work synergistically with the medical plan, lifestyle, and psychological state to provide maximum supportive value.