Infertility manifests itself through hypothalamic amenorrhea, a condition characterized by low energy availability and menstrual irregularity, with or without food deficiency. Menstrual irregularity refers to both missed periods and the anovulatory cycle during which the egg is not released. Hypothalamic amenorrhea due to chronic deprivation is associated with adrenal fatigue and euthyroid sick syndrome. It's possible that a lack of food could prevent you from getting pregnant if you have a long history of exercising and dieting to lose weight. Returning to a normal calorie intake can reverse the problem, making pregnancy possible. 5. You're Losing Hair Hair loss is a key sign of nutritional deficiency in proteins and carbohydrates, or both. It is accelerated by hormonal changes that occur due to chronic undernutrition and declines in sex hormones such as estrogen, testosterone and progesterone. Additionally, it is also a common symptom of hypothyroidism, a condition caused by prolonged calorie restriction. It is good to deeply reconsider your diet if you find that your hair is falling out at a very high rate. You should prioritize eating nutrient-dense whole foods to stop hair loss and reverse it. 6. Fluctuating blood sugar levels