Yes, being in a Calorie deficit while on period can potentially impact your energy levels and overall well-being. Menstruation already places additional energy demands on the body, and a calorie deficit may exacerbate fatigue and discomfort. It's essential to listen to your body's cues and ensure you're providing it with adequate nutrition during this time to maintain energy, support hormonal balance, and promote overall well-being. Consulting a healthcare professional or registered dietitian can help you determine a balanced approach to calorie intake during your period to support both your health and weight management goals.