A lot of ways. First and foremost is just general fatigue. Malnutrition will decrease your energy by a lot and you will get tired way faster and you’re more likely to get headaches. Other ways can include your body developing cravings for vitamin rich foods like vegetables or your body cannibalizing itself by breaking down fats and muscles in your body as a last ditch effort to meet nutrient needs.
So if you are feeling tired, finding yourself craving food different from your usual diet, and after a while sudden weight loss and muscle deteriotion. Then thats your body telling you that you are malnourished.
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