Food Cravings
Your organs need water to release glycogen, which is the fuel reserve meant to keep our bodies running properly. When you are dehydrated, you get food cravings for sweet or salty snacks because you are experiencing difficulty with glycogen production. If your body is dehydrated, you may feel a hunger sensation, which is your body asking for hydration, so the energy stores can continue running smoothly.
Headaches
The brain is encased in a sack of fluid that guards it from trauma and from bumping up against your skull. When you experience dehydration, that fluid sack is depleted, and your brain can actually press against your skull, which causes headaches.
