Weight changes can significantly influence the menstrual cycle and may contribute to signs of a late period. Sudden weight loss, often due to restrictive diets or increased exercise, can lower body fat to a level that disrupts hormone production. Estrogen, which plays a crucial role in ovulation and menstruation, depends partly on healthy fat stores. Without sufficient levels, ovulation may be delayed or absent, leading to late or missed periods. On the other hand, rapid weight gain can also create imbalances, as excess fat tissue can alter estrogen levels and disrupt the cycle.

Signs of weight-related menstrual changes often include fatigue, shifts in appetite, and mood fluctuations alongside delayed cycles. These changes are typically the body's response to disruptions in energy availability and hormone regulation. Restoring balance through stable nutrition and maintaining a healthy weight range often improves menstrual regularity. It is worth noting that small, gradual fluctuations in weight are common and usually do not cause significant disruption. However, consistent or dramatic weight changes that repeatedly affect the menstrual cycle may warrant further evaluation to ensure long-term hormonal and reproductive health.