Most nutrition tracking apps ask you to count calories. For PCOS, that's the wrong number.
Calories matter eventually — but if you fix protein, fibre, and net carbs first, calories tend to fall into line on their own. More importantly, fixing those three numbers addresses the actual mechanism driving most PCOS symptoms: chronic low-grade insulin spiking throughout the day.
Protein
Compared to net carbs, protein produces a much smaller insulin response. It also keeps you full the longest, preserves muscle (your best long-term insulin sensitivity asset), and raises your resting metabolic rate more than fat or carbohydrates do — a property called the thermic effect of food.
For women with PCOS, research consistently points to a target of 25–30g of protein per meal — not per day as a single block. Spreading protein across meals keeps blood sugar more stable throughout the day, which prevents the blood sugar dip in the afternoon that often triggers cortisol release and evening cravings.
Most women with PCOS are eating roughly half of what they need: 40–60g/day instead of 100–130g. The shortfall is usually invisible because protein-poor meals still feel filling in the moment — just not for long.
Fibre
Fibre slows the absorption of everything else you eat. When carbohydrates travel through the gut alongside adequate fibre, glucose enters the bloodstream more gradually, producing a smaller insulin spike for the same amount of food.
The target is 25–35g per day. Below 20g, the buffering effect is negligible. Most standard Western diets deliver 15–18g — which is why "eating healthy" without specifically tracking fibre often fails to move the needle for PCOS.
Soluble fibre (oats, legumes, chia seeds, apples) has the strongest effect on insulin response because it forms a gel in the gut that physically slows digestion. Insoluble fibre (most vegetables, wholegrains) supports gut health and has its own hormonal benefits but plays a smaller direct role in glucose management.
Net carbs
Net carbs = total carbohydrates − fibre. Because fibre is not digested and raises blood glucose minimally, subtracting it gives a more accurate picture of what's actually triggering an insulin response than total carbohydrate counts.
For most women with PCOS, keeping net carbs under 100g/day — and not exceeding 30–35g per meal — produces measurable improvements in fasting insulin within 6–8 weeks. That ceiling sounds restrictive until you realise that a single plate of white rice, pasta, or a large potato can already sit at 60–80g on its own.
The full chapter includes a practical food table showing protein, fibre, and net carbs for 40 common foods — plus how to structure your plate at each meal without meticulously weighing everything.
Want the rest? Chapter 3 continues in the guide — along with 9 more chapters, practical food tables, and a ready-to-use 7-day plan.
