Yes, fasting can indeed cause stress. When you're fasting, you're increasing the release of hormones like epinephrine and cortisol, which are associated with stress responses. This can make you feel more alert and energized, but it also brings you closer to the edge of peak stress. If you're fasting for too long or during periods of high stress, it can push you into a state of chronic stress, which can have negative effects on your health, including impacts on your reproductive axis, hair, sleep, and immune system. So, while fasting can be a useful tool for certain goals, it's important to balance it with your overall state of stress and well-being.