Could you tell me what happens when your body doesn't get enough protein?

Plenty!: 1.Constant craving of carbs! 2.Muscle and/or joint pain! these are signs of mild deficiency! symptoms of severe protein deficiency: 1.Edema (swelling) 2.Thinning brittle hair and/or hair loss 3.Ridges in finger and toe nails 4.Skin rashes; dry skin 5.Weak and tired 6.Muscle soreness and cramps 7.Slow healing 8.Skin ulcers 9.Sleep issues 10.Headache 11.Nausea 12.Fainting 13.Depression/anxiety!