PCOS affects 1 in 8 women. Nutrition is one of the most powerful tools they have.
Insulin resistance is central to most PCOS cases. What you eat — and when — directly affects your symptoms, cycle regularity, and hormone balance. No standard calorie tracker accounts for any of this.
How PCOS (Polycystic Ovary Syndrome) affects what you eat
PCOS is characterised by insulin resistance, elevated androgens, and disrupted ovulation. Insulin resistance means your cells don't respond normally to insulin — leading to higher circulating insulin that signals the ovaries to produce more androgens. Diet is the most powerful lifestyle lever for improving insulin sensitivity and reducing androgen excess. Carbohydrate quality, glycaemic load, and meal timing all matter significantly.
What your body needs most
Prevent the insulin spikes that drive androgen production. Whole grains, legumes, and most vegetables are ideal.
Slows glucose absorption, reduces insulin response, and supports satiety — all directly beneficial for insulin resistance.
Acts as an insulin sensitiser. Found in wholegrains, legumes, and nuts. Supplements are clinically effective for PCOS.
Involved in insulin signalling. Deficiency worsens insulin resistance.
Reduces androgen activity and supports healthy ovulation.
Reduce inflammation and improve insulin sensitivity.
Deficiency is very common in PCOS and correlates with worse insulin resistance and cycle irregularity.
Foods to eat more of
Low GI, high protein, high inositol. Ideal for insulin management.
Omega-3s improve insulin sensitivity and reduce inflammation.
Shown to improve insulin sensitivity and fasting glucose in PCOS-specific studies.
Magnesium + antioxidants + fibre with minimal glucose impact.
High protein, no carbohydrates, and support satiety without insulin spike.
Antioxidants + fibre with lower sugar load than most fruits.
Protein + healthy fat to slow glucose absorption at meals.
Foods to cut back
Spike insulin rapidly. The most direct dietary driver of androgen excess in insulin-resistant PCOS.
Inflammatory and high in trans fats that worsen insulin resistance.
Impairs insulin signalling and stresses the liver's role in hormone clearance.
Watermelon, dates, ripe bananas — fine in moderation, but pairing with protein helps blunt the insulin response.
How your cycle interacts with PCOS (Polycystic Ovary Syndrome)
PCOS often causes irregular cycles, which makes phase-based tracking more complex. Oli uses the actual cycle data from Apple Health rather than assuming a 28-day cycle — so it works even when your cycle doesn't.
Explore cycle nutrition →What Oli does automatically for you
Tracks your menstrual cycle via Apple Health — even if it's irregular (common in PCOS).
Prioritises low-GI and high-protein foods in AI suggestions.
Monitors protein intake at each meal to support insulin management.
Adjusts targets for luteal phase, when insulin resistance can worsen.
Wearable integration adjusts targets when activity data shows higher training load.
iOS first · Free to try · No card required
Important: Nutrition is an important part of PCOS management but should be part of a broader plan with your doctor. Many women with PCOS benefit significantly from working with an endocrinologist or registered dietitian.