What is the Harvard Fertility Diet Score?

The Harvard Fertility Diet Score comes from the Nurses' Health Study II (Chavarro et al., Obstetrics & Gynecology, 2007), which followed 17,544 women over 8 years. It identifies 8 dietary patterns associated with lower ovulatory disorder infertility. Women with five or more low-risk factors (this diet pattern plus a healthy weight and regular activity) had roughly 69% lower risk, and the authors estimated that up to 66% of ovulatory infertility in that cohort was attributable to those modifiable factors. These are observational associations, not proof of cause. Two findings were counterintuitive: high-fat dairy rather than low-fat dairy was protective, and plant protein rather than animal protein was strongly associated with restored ovulatory function. This calculator scores each of the 8 axes from 1 to 5 points, for a maximum of 40.

How long before trying to conceive should I start pre-conception nutrition?

At least three months before conception. An oocyte takes roughly 90 days to mature through the antral phase, so the nutritional environment you build today shapes the eggs you will ovulate a quarter of a year from now. Folate is the more urgent case: the neural tube closes between gestational day 21 and 28, usually before a pregnancy is confirmed, so folate stores must already be built up at the point of conception rather than started after a positive test.

How much folic acid do I need before pregnancy, and who needs the 4,000 µg dose?

The standard pre-conception recommendation is 400 µg of folic acid daily, with a total folate target of around 600 µg dietary folate equivalents. Under ACOG Committee Opinion 762 the dose rises tenfold to 4,000 µg daily for high-risk profiles: a previous pregnancy affected by a neural tube defect, anticonvulsant medication, insulin-dependent diabetes, or prior bariatric surgery. The high-dose protocol is a medical decision, so confirm your exact dose with your doctor, as recommendations vary by guideline body.

Why do vegetarians need algal DHA instead of flaxseeds for fertility?

Flaxseeds and walnuts supply ALA, not DHA. Hepatic conversion of ALA to DHA, the fatty acid that matters for endometrial receptivity, oocyte membrane integrity and fetal neurodevelopment, is only about 0–5% efficient, so plant ALA sources alone do not reliably raise tissue DHA. For vegetarians and vegans, algal DHA is the practical route: studies show it raises tissue DHA to levels comparable with fish oil, with no mercury exposure. The pre-conception DHA plus EPA target used here is 600–1,000 mg per day.

How much iron do Indian women need before conception?

ICMR-NIN 2024 sets the RDA for adult Indian women at 29 mg of iron per day, raised from 21 mg to reflect the lower bioavailability of iron in a largely cereal-based diet, and well above the US RDA of 18 mg. This calculator scores your gap against that 29 mg RDA. Separately, WHO recommends 30–60 mg of daily preventive elemental iron supplementation in settings with high anaemia prevalence, the basis of India's national Iron-Folic Acid programme. That is a supplementation dose for women who are or may be anaemic, not the general dietary RDA. NFHS-5 found 57% of Indian women aged 15–49 are clinically anaemic.

Does this calculator diagnose infertility?

No. It provides educational estimates of dietary quality and likely micronutrient gaps, not a clinical diagnosis, and it does not substitute for consultation with a registered dietitian or gynaecologist. Micronutrient figures are directional estimates derived from your own dietary and supplement answers. Actual status requires laboratory testing. Anyone with a confirmed infertility diagnosis, PCOS, or prior pregnancy loss should seek specialist pre-conception care.

Pre-Conception Fertility Nutrition Calculator

🌿 Designed for you if

Planning to conceive in the next 3–12 months
Indian or South Asian, aged 20–42
Struggling with PCOS, irregular cycles, or prior loss
Want an India-specific, clinically grounded food plan

📋 What to have ready

Essential: Age, height, weight, cycle details
Helpful: Blood test results (ferritin, Vit D, folate)
Helpful: Current supplement list
Optional: AMH, FSH, fasting insulin values

⏱ Time required

5 min

5 steps · auto-saves progress
Results appear after step 5

🧮 Harvard Fertility Diet Score (max 40 pts) · 🌾 ICMR 2024 micronutrient gap analysis · 🐟 IFCT 2017 Indian food database · 🌸 Traditional Pre-Conception Support Notes · 📋 Personalised 7-day Indian meal plan · 🧮 Harvard Fertility Diet Score (max 40 pts) · 🌾 ICMR 2024 micronutrient gap analysis · 🐟 IFCT 2017 Indian food database · 🌸 Traditional Pre-Conception Support Notes · 📋 Personalised 7-day Indian meal plan

Your personal profile

BMI is the first algorithmic gate. Both low and high BMI suppress ovulatory function, so the calculator adjusts every nutrient target based on your body composition.

BMI (Live)

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Enter height & weight

Your age *

yrs

Height & Weight *

WHO · ACOG Target BMI: 18.5–24.9 kg/m². Outside this range, anovulation risk rises and caloric targets are auto-adjusted.

Height

Weight

Menstrual cycle regularity *

Clinical flags (select all that apply)

These trigger specific algorithmic overrides. Prior NTD history, anticonvulsant medication, insulin-dependent diabetes, or prior bariatric surgery can activate the high-dose (4,000 µg) folate protocol, 10 times the standard dose. Confirm your exact dose with your doctor, as recommendations vary by guideline body.

Lifestyle factors

Caffeine, alcohol, activity, and stress are independent fertility modulators that adjust the algorithmic baseline before any food scoring begins.

Daily caffeine intake

ACOG Keep caffeine under 200 mg/day before and during pregnancy. 1 cup coffee ≈ 80–100 mg · 1 cup tea ≈ 30–50 mg · 1 can cola ≈ 35 mg.

Alcohol consumption

Weekly exercise

Target: ≥150 min/week moderate activity improves peripheral insulin sensitivity and ovulatory function (ACOG/WHO).

Chronic stress level

Chronic stress raises cortisol, which is thought to blunt GnRH pulsatility in the HPO axis. A high answer here adds traditional support notes, which are for discussion with your doctor rather than recommendations.

Your typical diet

These 8 questions power the Harvard Fertility Diet Score, one of the best-known research-based dietary patterns linked with ovulatory infertility risk. All 8 are required for an accurate score. Answer for your usual weekly pattern.

Axis 1 How often do you use healthy oils in cooking?

Mustard oil, ghee (1 tsp), coconut oil, sesame oil. Trans fats from vanaspati and packaged snacks are the strongest dietary predictor of anovulation.

Axis 2 How much animal protein (red meat, chicken) do you eat?

High red meat correlates with elevated oxidative stress. Plant proteins improve insulin sensitivity.

Axis 3 What is your primary carbohydrate source?

High glycemic load triggers hyperinsulinaemia → ovarian androgen excess → anovulation. Ragi, jowar, bajra score highest.

Axis 4 What type of dairy do you primarily consume?

Chavarro et al., 2007 Counterintuitively, full-fat dairy was the protective choice in this cohort. Skimming removes fat-soluble secosteroids including Vitamin D analogues.

Axis 5 How many servings of vegetables do you eat daily?

ICMR-NIN 2024 400 g total vegetables/day, including 100 g green leafy vegetables (spinach, methi, moringa). GLV are your primary natural folate source.

Axis 6 How often do you eat omega-3 rich foods?

DHA/EPA working target: 600–1,000 mg/day (guidance varies between bodies; ≥200 mg DHA/day is the widely cited pregnancy minimum). Sardines/anchovies/hilsa: best marine DHA. Walnuts & flaxseeds: ALA only (5% converts to DHA).

Axis 7 What are your primary iron sources?

Non-heme iron (plant sources) is rewarded; heme iron (red meat) is penalised due to oxidative stress. Always pair plant iron with Vitamin C (amla, lemon juice).

Axis 8 Are you taking a daily multivitamin or prenatal supplement?

CDC · ACOG Start folic acid at least 1 month before conception, ideally 3 months before. Multivitamin use is a proxy for adequate folic acid and B12 status.

Nutrient intake check

Estimating your intake of the five key fertility micronutrients allows precise gap analysis against ICMR 2024 thresholds. Leave blank if unsure. The algorithm uses your Step 3 dietary data.

💡 All fields are optional. Your Fertility Score calculates from whatever data you provide.

Current daily folic acid intake from supplements

Iron supplement dose elemental iron/day

Vitamin D status from recent blood test or estimate

Vitamin D <20 ng/mL linked to poor IVF outcomes, PCOS exacerbation, and reduced AMH signalling. The algorithm scales recommendation to 2,000 IU/day if deficient.

Sun exposure

HARVARD FERTILITY DIET SCORE

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Complete the assessment

MICRONUTRIENT GAPS

Folate 400–800 µg

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Iron 29 mg (ICMR-NIN 2024)

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Zinc 8–15 mg

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Omega-3 600–1000 mg DHA+EPA

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Vitamin D 600–2000 IU

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Score updates as you progress. Full plan appears after Step 5.

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Your personal profile

Lifestyle factors

Your typical diet

Nutrient intake check

Clinical biomarkers

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Lifestyle factors

Your typical diet

Nutrient intake check

Clinical biomarkers

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