What is a good Fertility Diet Score?

On the official Harvard scale, scores range from 10 to 50. Research shows that women with scores of 39 or higher had a significantly lower risk of ovulatory infertility. However, any improvement in your score is a step in the right direction!

Does the Fertility Diet work for men too?

Yes! While the original Harvard study focused on women, research shows that antioxidants, healthy fats, and plant-based proteins significantly improve sperm count, motility, and morphology in men.

How long does it take to see results from changing my diet?

It takes about 90 days (three months) for an egg to mature before it is ovulated. Therefore, it is ideal to practice these dietary habits for at least three months to see the maximum benefit on egg quality.

Why is full-fat dairy recommended over low-fat dairy for fertility?

The theory is that removing fat from dairy alters the balance of sex hormones in the milk, leaving behind a higher concentration of male hormones (androgens), which can interfere with ovulation. Keeping the fat helps preserve the natural hormonal balance.

How to Calculate Your Fertility Diet Score: A Complete Guide

Trying to conceive can feel like embarking on a wild rollercoaster ride. Between tracking ovulation windows, decoding basal body temperature charts, and navigating endless forums, it is easy to feel overwhelmed. But what if one of the most powerful tools to support your fertility journey was already in your kitchen?

Enter the Harvard Fertility Diet. Based on groundbreaking clinical research, this dietary approach offers a science-backed roadmap to naturally boosting your reproductive health.

In this guide, we will break down the science behind the Fertility Diet Score, walk through a real-life scoring example with actual numbers, and show you how to optimize your plate week-by-week.

What is the Harvard Fertility Diet?

The Fertility Diet is not a restrictive fad diet or a quick-fix cleanse. It is a set of dietary guidelines developed by researchers from the Harvard T.H. Chan School of Public Health.

In their landmark Nurses' Health Study II, researchers followed over 18,000 women who were trying to get pregnant. They discovered that women who followed a specific pattern of eating had a 66% lower risk of ovulatory infertility and a 27% lower risk of other causes of infertility compared to those who did not follow the pattern.

To make these findings actionable, researchers created a scoring system. By evaluating ten specific dietary factors, you can calculate your personal Fertility Diet Score. The higher your score, the lower your risk of fertility issues related to ovulation.

The Science of the Fertility Diet Score: How It Works

The scoring system looks at how much of certain foods you eat. For each category, you receive a score from 1 (least fertility-friendly) to 5 (most fertility-friendly). This means a perfect score is 50 points.

Here are the core pillars of the scoring system:

1. Fats: The Good vs. The Bad

Minimize Trans Fats: Trans fats (found in many fried and processed foods) increase insulin resistance, which can disrupt ovulation.
Maximize Monounsaturated Fats: Foods like avocados, olive oil, and nuts improve insulin sensitivity and lower inflammation.

2. Protein: Plant Power

Swap Animal Protein for Plant Protein: Consuming more protein from beans, peas, tofu, and nuts instead of red meat or poultry is strongly linked to improved fertility.

3. Carbohydrates: Slow and Steady

Choose Complex Carbs: Highly refined carbs (white bread, sugary sodas) cause rapid spikes in blood sugar and insulin. Choosing high-fiber, low-glycemic carbohydrates (quinoa, oats, brown rice) keeps blood sugar stable.

4. Dairy: The Surprising Full-Fat Rule

Go Full-Fat: Surprisingly, the Harvard study found that high intakes of low-fat dairy (like skim milk or low-fat yogurt) actually increased the risk of ovulatory infertility. Conversely, consuming one to two servings of full-fat dairy (like whole milk or full-fat Greek yogurt) per day was protective.

5. Micronutrients: Iron and Vitamins

Non-Heme Iron: Iron from plant sources (spinach, lentils) and supplements is associated with a lower risk of infertility.
Multivitamins: Taking a daily multivitamin containing at least 400 micrograms of folic acid is crucial.

Step-by-Step Scoring with Real Numbers

Let's look at a practical example. Meet Sarah. She is 31 and has been trying to conceive for six months. She wants to see how her current diet aligns with the Harvard guidelines.

Here is a look at Sarah's average daily intake and how we calculate her score:

1. Trans Fat Intake

Sarah's Diet: She eats processed snacks occasionally, getting about 1.5% of her daily calories from trans fats.
Scoring: Because she still consumes some trans fats, she gets a 2 out of 5.

2. Monounsaturated to Saturated Fat Ratio

Sarah's Diet: She cooks with olive oil and eats half an avocado daily. Her ratio of healthy monounsaturated fats to saturated fats is high.
Scoring: This healthy habit earns her a 5 out of 5.

3. Protein Source (Plant vs. Animal)

Sarah's Diet: She eats chicken or beef almost every day and rarely eats beans or lentils.
Scoring: Because her protein is heavily animal-based, she scores a 1 out of 5.

4. Carbohydrates (Glycemic Index)

Sarah's Diet: She loves white pasta and white bread, but she does eat oatmeal for breakfast.
Scoring: Her high-glycemic choices drag her score down to a 2 out of 5.

5. Dairy Choice

Sarah's Diet: She drinks skim milk in her morning coffee and eats fat-free yogurt.
Scoring: Counterintuitively, low-fat dairy hurts her score here. She receives a 1 out of 5.

6. Iron and Multivitamins

Sarah's Diet: She takes a prenatal vitamin with folic acid and iron every day.
Scoring: A perfect habit! She scores a 5 out of 5.

Sarah's Total Fertility Diet Score

By adding up her scores across all categories, Sarah gets a 16 out of 30 (on this simplified 6-category scale).

While 16 is a great starting baseline, it shows there is plenty of room for small, impactful adjustments! By swapping her skim milk for whole milk and trading one chicken dinner a week for a lentil chili, Sarah can quickly boost her score.

How to Improve Your Score Week-by-Week

You do not need to overhaul your entire pantry overnight. In fact, making sudden, drastic changes can cause stress, which isn't helpful for fertility either! Instead, try a gradual, week-by-week approach:

Week 1: The Dairy Swap. Swap out your skim milk or low-fat yogurt for the full-fat versions. Enjoy a scoop of full-fat Greek yogurt with berries.
Week 2: Meatless Mondays. Swap one or two meat-based meals for plant-based proteins. Try a chickpea curry or a black bean bowl.
Week 3: Swap Your Carbs. Swap white rice for brown rice or quinoa. Switch white bread for 100% whole grain or sourdough bread.
Week 4: Upgrade Your Fats. Drizzle extra virgin olive oil on your salads and snack on a handful of walnuts or almonds instead of chips.

Ready to Find Your Score?

Curious about where your diet stands? You do not have to do the math by hand! Use the Calkulon Fertility Diet Score Calculator to get an instant, personalized breakdown of your diet.

Our friendly tool will calculate your score, highlight your nutritional strengths, and provide easy, practical tips to help you optimize your fertility journey step-by-step. Let's build a healthy foundation for your future family together!