Water is the essence of life. Every living thing needs water to survive, right down to every cell in all plants and animals. Our bodies are made up of nearly 75% water and in order to thrive, we must supply all the cells in our bodies with adequate water so these tiny magical building blocks that make up our bodies can carry out all their biological processes and this included utilizing our food for energy.
Check out this article I wiore for Whole Life Challenge which explain why chronic dehydration might be making you fat.
https://www.wholelifechallenge.com/how-chronic-dehydration-can-make-you-fat-tired-and-weak/