Apart from losing energy, feeling tired, and unexpected weight loss, other signs signal you're just not eating enough or enough nutrition-filled food. These include: - Hair loss - Constant hunger or complete loss of any hunger - Inability to get pregnant if you're trying - Sleeping issues - Constant irritability - Feeling cold 24/7 - Constipation - Anxiety If you're experiencing a loss of appetite coupled with feeling full easily when taking a few bites of your food, you could be suffering from early satiety. There could be other warning signs, and it's best to recognize them early to start your treatment.