PCOS and insulin resistance often occur simultaneously, creating a vicious circle of hormonal and metabolic disorders. A diet that stabilises glucose and insulin levels, based on products with a low glycaemic index, fibre, complete protein and healthy fats, plays an important role in therapy. The most common mistakes are to exclude carbohydrates, forgo fruit and under-supply protein. Meanwhile, complex carbohydrates, fresh fruit and good sources of protein support hormone balance, improve insulin sensitivity and alleviate inflammation, making it easier to control weight and reduce disease symptoms.