A dietitian reveals the 3 signs you might be dehydrated

Most of us spend our summer days out in the sun, and so we often end up dehydrated - without even realizing it.

We're constantly sweating and running around, and rarely stop to consider whether we had enough water that day, registered dietitian Amy Shapiro of Real Nutrition NYC told INSIDER.

"It's pretty common if you're not drinking enough fluids to become dehydrated in the summer because it's so hot, your body loses water," Shapiro said. "We're often so busy, we're not really thinking about drinking, and by the time we drink we're already dehydrated."

Dehydration can lead to severe health complications, including heatstroke, brain swelling, seizures and in extreme cases, even kidney failure and death.

The dietitian shared the three major signs of dehydration you need to look out for.