Fork-First FertilityGlycemic Index and Fertility: What the Research Shows
Fork-First Fertility curates peer-reviewed research on fertility and food and builds personalised fertility food plans backed by the evidence.
The connection between blood sugar, insulin, and fertility is one of the better-established links in the nutritional research. It's also one of the most practically actionable.
High glycaemic diets — those that produce rapid spikes in blood glucose — are associated with elevated insulin levels, which in turn affect the hormonal signalling that governs ovulation.
Research from the Harvard Nurses' Health Study and subsequent trials showed that women consuming higher-glycaemic diets had meaningfully higher rates of ovulatory infertility compared to women eating lower-glycemic patterns, independent of overall calorie intake.
This does not mean carbohydrates are the enemy of fertility. The research distinguishes clearly between refined carbohydrates and complex, lower-glycemic sources: the effect is in the type, not the presence, of carbohydrate. The studies below set out the evidence in detail.
How that evidence applies depends on your specific hormonal picture. Insulin sensitivity, PCOS status, and baseline dietary patterns all shape which glycemic adjustments are most relevant for you.
This research shapes Fork-First’s fertility food recommendations. Discover yours.
Get your Fork-First PlanThese studies shape how Fork-First's proprietary algorithm works. But research applied equally to everyone is just more generic advice.
The Fork-First assessment looks at your specific situation, taking into account your physical, mental, and emotional health and well-being, and makes suggestions of foods to eat and foods to avoid that map to your specific circumstances.