How Much Protein Do You Need with PCOS?

How much protein a day: the table

Protein needs scale with body size, so they're given in grams per kilogram of body weight (g/kg). The general minimum for adults is 0.8 g/kg a day — the amount that prevents deficiency. For appetite control and keeping muscle while you lose fat, a 2015 expert review in the American Journal of Clinical Nutrition pointed to 1.2–1.6 g/kg a day. ⁴

To work out your own number: weight in kg × 1.2 for the lower end, × 1.6 for the upper end. Weight in pounds? Divide by 2.2 first.

Why protein matters with PCOS

Protein doesn't treat PCOS. What it does is make the things that do help — steady blood sugar, a modest calorie deficit if you want to lose weight, keeping your muscle — easier to stick to:

• Fullness. Higher-protein meals leave people feeling fuller and raise satiety hormones. ⁴ With PCOS, where cravings and hunger are common complaints, that matters day to day.
• Steadier blood sugar. Swapping some carbohydrate for protein means a smaller glucose rise after meals — relevant because most women with PCOS have some degree of insulin resistance.
• Keeping muscle while losing fat. Higher-protein weight-loss diets preserve more lean mass than lower-protein ones. ⁴ Muscle is where much of your blood sugar gets used, so losing less of it is a win for insulin sensitivity.

What the PCOS studies actually show

There are only a handful of trials testing protein specifically in PCOS, and they're small. Here's an honest summary.

The Danish trial (2012). 57 women with PCOS ate either a high-protein diet (over 40% of calories from protein) or a standard-protein diet (under 15%) for six months, without counting calories. Those on high protein lost on average 4.4 kg more weight and 4.3 kg more body fat, their waists shrank more, and their blood glucose fell more — even after accounting for the weight loss. Testosterone and cholesterol didn't differ between groups. ² The catch: only 27 women finished the study.

The Australian trial (2003). Overweight women with PCOS followed a calorie-reduced diet that was either higher protein (30%) or standard (15%) for 12 weeks, then four weeks of maintenance. Both groups lost about 7.5% of their body weight, and periods, insulin resistance and cholesterol improved in both — the weight loss drove the benefits. The higher-protein group had only small extra advantages. ³

The official guideline. The 2023 international PCOS guideline — written with input from organisations in 71 countries — concludes there is no evidence that any one diet composition beats the others for weight, metabolic, hormonal, reproductive or psychological outcomes. ¹

How much per meal (and why spreading it out matters)

Most people eat a small, carb-heavy breakfast, a moderate lunch and most of their protein at dinner. In a small 2014 study, the same total protein spread evenly across three meals (about 30 g each) produced 25% more muscle-building over 24 hours than eating most of it at dinner. ⁵ The expert review behind the 1.2–1.6 g/kg range also suggested meals of at least 25–30 g. ⁴

• Three meals a day: 25–40 g at each, depending on your daily total.
• Two meals a day (common with an eating window or intermittent fasting): each meal has to carry more — often 45–60 g. That's very doable with a lean protein plus a booster, e.g. a chicken breast with a side of Greek yogurt sauce.
• Breakfast is the meal most people come up short on. See our high-protein PCOS breakfast ideas for 30 g+ options that aren't just eggs.

The best protein sources, by protein per portion

Values are approximate, for typical cooked portions (USDA data).

Plant-based? It's entirely possible, but you'll usually need two or three sources per meal — say tofu plus edamame plus a lentil side — to reach 25–30 g. The bonus is the fibre, which helps with insulin resistance and fullness.

Getting enough protein without too many calories

This is where most high-protein plans go wrong. Fatty cuts, cheese, whole eggs and nuts bring a lot of fat — and calories — along with their protein. Three practical rules:

1. Build each meal around a lean protein (chicken or turkey breast, white fish, prawns, tuna, tofu).
2. Keep rich proteins moderate — around 120–180 g of salmon, beef or lamb, or two eggs — and top up with a lean booster like Greek yogurt or cottage cheese instead of a bigger portion.
3. Don't add protein on top — swap. Replace some of the starch on your plate with protein rather than adding it to an already full meal.

For more on building whole days this way, see our guide to losing weight with PCOS and the PCOS nutrition guide.

Who should be careful

For people with healthy kidneys, intakes up to about 1.6 g/kg a day are considered safe. Check with your doctor or a registered dietitian first if you:

• have kidney disease or reduced kidney function
• are pregnant or breastfeeding (needs change, and your care team should guide them)
• have a history of disordered eating — tracking grams of anything can be unhelpful