If you’re cutting the calories you may also be cutting the very nutrients your hair needs to grow too.
Hair growth is a pretty low-priority task for our body, so it will likely be one of the first processes to be affected by restricting food.
For example, the stress of not having enough calories will cause your body to prioritise functions like energy production, digestion and brain functions over hair growth.
Even when you do ditch the diet, it can take a few months for the hair growth cycle to repair and stop excessively shedding.