Can exercise and a healthy diet fix hormonal problems like irregular periods (not caused by pcos or similar) without needing birth control pills?

Weight loss: In some women with pcos who are also overweight weight loss is quite effective at correcting the hormonal imbalance.

A healthy life: Style never hurts, but it is unlikely to help a medical problem causing irregular periods, except when due to obesity, Insulin resistance, pcps etc. Talk w/your doctor about diagnosis and potential treatment.