What Not to Eat During IVF in Thailand? Dietary Taboos for Stimulation and Transfer Stages
====== Scene Opening (Random Mechanism: Real Consultation Scenario) ======
Last month at a fertility center in Bangkok, a patient from Shenzhen was found to have uneven follicle development during an ultrasound on day 8 of ovarian stimulation. Upon questioning her diet, it was discovered that she had been drinking a cup of Angelica sinensis and red date tea every day—a "uterine warming formula" her mother had specifically recommended. The attending physician immediately asked her to stop and explained the potential impact of blood-activating foods on the stimulation cycle. Similar cases where improper diet interferes with treatment progress are not uncommon in clinical practice.
From the perspective of a reproductive specialist, this article systematically outlines the dietary taboos at different stages of IVF in Thailand, helping patients avoid those "seemingly harmless but actually interfering" foods.
What Not to Eat During IVF in Thailand: Overall Dietary Taboo List
During IVF treatment in Thailand, dietary taboos need to be categorized by stage. Below is a summary of core taboos for each stage:
| Treatment Stage | Categories of Forbidden Foods | Specific Food Examples |
|---|---|---|
| Ovarian Stimulation | Blood-activating and stasis-resolving, spicy and irritating, raw and cold foods | Angelica sinensis, Ligusticum chuanxiong, Salvia miltiorrhiza, hawthorn, chili peppers, iced drinks, ice cream, raw fish |
| After Egg Retrieval | Gas-producing foods, hard-to-digest foods, blood-activating foods | Beans, sweet potatoes, glutinous rice, rice cakes, Angelica sinensis, red dates, donkey-hide gelatin |
| After Embryo Transfer | Cold fruits and vegetables, allergenic foods, foods that may cause uterine contractions | Watermelon, bitter melon, crab, softshell turtle, Job's tears, mango, seafood (for those with allergies) |
| General for Entire Cycle | Alcohol, excessive caffeine, supplements with unknown ingredients | White liquor, red wine, coffee >2 cups/day, strong tea, bird's nest (from unregulated sources), deer antler |
Why Dietary Restrictions Are Needed During IVF: Physiological Mechanisms and Treatment Logic
The core steps of IVF treatment—ovarian stimulation, egg retrieval, and embryo transfer—all rely on precise hormonal regulation and a stable uterine environment. Diet directly affects treatment outcomes through the following pathways:
1. Ovarian Stimulation: Blood-Activating Foods Interfere with Follicle Synchrony
The goal of stimulation medications is to achieve synchronized development of a cohort of follicles. Blood-activating and stasis-resolving foods (e.g., Angelica sinensis, Ligusticum chuanxiong, Salvia miltiorrhiza, hawthorn) dilate blood vessels and increase pelvic blood flow, potentially leading to asynchronous follicle development and affecting the number and maturity of retrieved eggs. Spicy foods (e.g., chili peppers, Sichuan pepper) stimulate the sympathetic nervous system and may disrupt the hypothalamic-pituitary-ovarian axis.
2. After Egg Retrieval: Gas-Producing and Hard-to-Digest Foods Worsen Bloating Risk
After egg retrieval, the ovaries are enlarged, and gastrointestinal motility is slowed. Gas-producing or hard-to-digest foods like beans, sweet potatoes, and glutinous rice can worsen bloating, abdominal pain, and even trigger nausea or vomiting. If ovarian hyperstimulation syndrome (OHSS) occurs, improper diet may exacerbate ascites.
3. After Transfer: Cold and Allergenic Foods Affect Endometrial Receptivity
Embryo implantation requires a stable uterine environment and good endometrial blood flow. Cold-natured foods (e.g., watermelon, bitter melon) may cause uterine smooth muscle contractions, interfering with implantation. Allergic reactions release histamine and other inflammatory mediators, reducing endometrial receptivity. Foods like Job's tears and crab are traditionally considered to have "miscarriage-inducing" tendencies, and modern research suggests they may affect prostaglandin metabolism.
====== C The Doctor's Perspective ======Reproductive Specialists' Real Views on Dietary Taboos
In clinical practice at Thai fertility centers, doctors' attitudes toward dietary taboos can be summarized as: "Don't panic excessively, but know the bottom line."
- Clearly Prohibited: Alcohol, tobacco, illegal drugs, and herbal supplements not approved by a doctor. These substances have clear evidence of affecting hormone levels, egg quality, and embryo development.
- Recommended to Avoid: Caffeine exceeding 200 mg per day (about 2 cups of coffee), high-dose blood-activating supplements (Angelica sinensis, donkey-hide gelatin, deer antler), and "fertility-boosting herbal decoctions" of unknown origin.
- Individualized Adjustment: Cold-natured foods, seafood, spicy foods—for patients with healthy gastrointestinal function and no allergy history, small amounts are usually not problematic; however, for those with sensitive stomachs, endometriosis, or a history of repeated implantation failure, strict avoidance is recommended.
Most Easily Overlooked Dietary Details
In clinical practice, patients often overlook the following details, which can become "hidden factors" affecting treatment progress:
① "Hidden" Blood-Activating Ingredients: Sauces, Broths, Herbal Teas
Many patients know not to eat Angelica sinensis directly but overlook hot pot bases, spice packets, and medicinal soup broths that contain it. Some local health teas in Thailand (e.g., ginger and red date tea, longan tea) may also have blood-activating effects. During the stimulation phase, it is advisable to choose meals with simple ingredients.
② "Traps" in Fruits
Watermelon, dragon fruit, bananas (cold-natured and high in sugar), and hawthorn (blood-activating) are common in Thailand. After transfer, patients often eat large amounts of watermelon to cool down, leading to diarrhea or uterine contractions. It is recommended to choose neutral fruits like apples, grapes, and cherries.
③ "Cooling" Herbal Teas and Herbs
Local Thai herbal teas and some "detoxifying" herbs (e.g., mesona, gotu kola) are common in convenience stores. These herbs have complex compositions; some may have uterine-stimulating or anticoagulant effects and should be avoided during IVF treatment.
④ Protein Supplementation Methods
After egg retrieval, high-quality protein is needed, but some patients consume large amounts of protein powder, soy milk, or seafood, which can cause bloating or allergic reactions. The correct approach is to consume protein in divided portions, choose multiple sources (eggs, fish, lean meat, whey protein), and monitor gastrointestinal reactions.
====== H Common Pitfalls ======Most Common Dietary Misconceptions
| Common Misconception | Incorrect Practice | Correct Advice |
|---|---|---|
| "Eating more soy products can build up the endometrium" | Drinking large amounts of soy milk and eating tofu daily, especially before transfer | Soy isoflavones have estrogen-like effects; excessive intake may interfere with the implantation window. One cup of soy milk per day or no discomfort is fine; no need to deliberately consume large amounts. |
| "Eating bird's nest or fish maw can improve success rates" | Buying expensive bird's nest or fish maw, even increasing the dosage on their own | Bird's nest and fish maw are essentially collagen, no different from ordinary protein. Products from unknown sources may carry a risk of heavy metal contamination. Not recommended as special supplements during treatment. |
| "Fruits are full of vitamins, so eating more is harmless" | Eating large amounts of tropical fruits (durian, mango, pineapple) during stimulation and after transfer | Tropical fruits are high in sugar and some are easily allergenic. Durian is high in calories and heaty, which may worsen inflammation. Limit daily fruit intake to 200g or less, choosing low-sugar, mild types. |
| "Drinking coffee to stay alert doesn't matter" | Drinking 3-4 cups of coffee or strong tea daily | Caffeine over 200 mg/day is associated with an increased risk of miscarriage. It is recommended to quit completely after transfer and limit to one cup or less during stimulation. |
| "Thai seafood is fresh, so eating more is good for protein" | Eating large amounts of shrimp, crab, and oysters after egg retrieval | Seafood is easily allergenic, and some shellfish may carry parasites or heavy metals. It is recommended to choose cooked fish, try one or two types at a time, and continue only if no allergic reaction occurs. |
Dietary Adjustment Differences for Patients of Different Ages
Age is an important factor affecting ovarian reserve, endometrial receptivity, and metabolic status. Dietary taboos have different emphases across age groups:
Under 35: Focus on Preventing OHSS and Weight Control
Younger patients typically have a better ovarian response and a relatively higher risk of OHSS after stimulation. At this stage, strictly control gas-producing and high-sugar foods to reduce the risk of bloating and ascites. Also avoid high-calorie diets that cause rapid weight gain, which can affect endocrine stability.
35-40: Focus on Endometrial Blood Flow and Antioxidants
In this age group, endometrial receptivity begins to decline. The diet should include more healthy fats (e.g., avocado, olive oil), vitamin E, and Coenzyme Q10 sources. Strictly avoid cold-natured foods and caffeine to maintain stable uterine blood flow.
Over 40: Focus on Metabolic Management and Anti-Inflammation
Older patients often have insulin resistance or chronic low-grade inflammation. Strictly limit refined carbohydrates, high-sugar fruits, and trans fats; increase anti-inflammatory foods like deep-sea fish and flaxseeds. Avoid any eating habits that may cause blood sugar fluctuations.
Differences in Dietary Advice Among Thai Fertility Centers
There are some differences in dietary guidance among fertility centers in Thailand, related to doctors' academic backgrounds and clinical experience:
- Thai Public Teaching Hospitals (e.g., King Chulalongkorn Memorial Hospital, Siriraj Hospital): Typically follow guidelines from Western reproductive societies, emphasizing avoidance of alcohol, caffeine, and unapproved supplements. They have fewer traditional "taboo" requirements and focus more on balanced nutrition and calorie control.
- High-End Private Fertility Centers in Thailand (e.g., BNH Hospital, Jetanin Hospital, First Fertility Center): Combine Western evidence-based medicine with local clinical experience, usually providing more detailed dietary lists including "recommended" and "avoid" specific foods. Some centers offer nutritional counseling for patients.
- Sino-Thai Cooperative Clinics: Often place more emphasis on traditional Chinese medicine (TCM) regulation, with a broader range of dietary taboos that may include categories like "cold-natured," "allergenic/irritant," and "blood-activating." Patients should proactively confirm with their doctor which taboos have clear evidence to avoid excessive restriction leading to nutritional deficiency.
Regardless of the center, patients should proactively request written dietary guidance from their doctor or coordinator before starting the cycle and inform them of their dietary habits and allergy history.
====== Q Frequently Asked Questions ======Frequently Asked Questions: Most Common Dietary Details Patients Ask About
Q1: Can I eat hot pot during ovarian stimulation?
Yes, but pay attention to the broth and dipping sauce. Avoid spicy or medicinal herb broths (which may contain Angelica sinensis or Ligusticum chuanxiong). Recommended choices are clear broth or tomato broth. Use soy sauce and vinegar as the main dipping sauce, avoiding large amounts of garlic paste or chili oil. Meat must be thoroughly cooked.
Q2: Will eating crab after embryo transfer really cause a miscarriage?
Currently, no high-quality research confirms that "eating crab directly causes miscarriage." However, crab is cold-natured and highly allergenic. For patients with sensitive stomachs or allergic tendencies, it may cause diarrhea or allergic reactions, indirectly affecting the uterine environment. It is recommended to avoid it for the first two weeks after transfer; after two weeks, if there is no discomfort, a small amount can be tried.
Q3: Can I drink coconut water in Thailand?
Coconut water is cool in nature and contains natural electrolytes. Drinking it in moderation (no more than 300 ml per day) after egg retrieval can help relieve bloating and replenish fluids. However, patients with a cold constitution or a tendency toward diarrhea after transfer should avoid it. For those at risk of OHSS, coconut water can be one option for fluid replacement, but not in excess.
Q4: Do I need to take local Thai "fertility" supplements?
It is not recommended to buy them on your own. Convenience stores and pharmacies in Thailand sell various "fertility" vitamins and herbal capsules with complex ingredients, some of which contain blood-activating or hormone-like components. If you need to supplement nutrients, choose brands and dosages recommended by your doctor, such as folic acid, Coenzyme Q10, and vitamin D.
Q5: What if I drank alcohol during ovarian stimulation?
Occasional small amounts of alcohol (e.g., one beer or glass of wine) usually do not significantly impact the cycle, but it is recommended to stop immediately and inform your doctor. Alcohol metabolites may affect egg quality and hormonal balance. If alcohol is consumed late in the stimulation phase or before transfer, consult your doctor to assess the risk.
====== Special Circumstances ======Dietary Adjustments for Special Conditions
Patients with Polycystic Ovary Syndrome (PCOS)
PCOS patients often have insulin resistance and hyperandrogenism. During IVF, strictly limit refined carbohydrates, high-sugar fruits, and sweets; increase dietary fiber and high-quality protein. Avoid high-glycemic-index foods that cause blood sugar fluctuations, affecting follicle quality and endometrial receptivity.
Patients with Endometriosis
Patients with endometriosis often have chronic pelvic inflammation. Strictly avoid alcohol, caffeine, and spicy foods; increase anti-inflammatory foods like deep-sea fish and flaxseeds. Some doctors recommend reducing red meat and dairy intake to lower inflammation levels.
Patients with Thyroid Dysfunction
Whether hyperthyroid or hypothyroid, avoid large amounts of cruciferous vegetables (e.g., broccoli, cabbage, kale), as their glucosinolates may interfere with iodine absorption and thyroid function. Also, be aware of the effect of soy products on thyroid medication; maintain a 4-hour interval between medication and food intake.
====== Closing: Risk Reminder ====== ====== Additional Practitioner Observation (R Module) ======Practitioner Observation: In nearly a decade of coordinating assisted reproduction in Thailand, I have seen too many cases of patients blindly supplementing because they "heard something was useful" or panicking excessively because they "heard something was harmful." What truly affects treatment outcomes is never a single food, but the overall dietary structure, daily routine, and mental state. The taboos listed here are based on clinical experience and available evidence, and I hope they are helpful for those preparing for pregnancy. — A fertility center coordinator working in Bangkok.
