Feeling dehydrated after drinking Gatorade is often a result of the high sugar content and sodium content in the Gatorade.
The high sugar and sodium content in Gatorade can cause increased thirst and increased urinated and make you feel dehydrated.
Although Gatorade is often hydrating for many people and is marketed as a hydrating drink it can make some people feel dehydrated instead.
The high sugar content in the Gatorade draws water from the body tissues and into the bloodstream which can lead to a temporary feeling of dehydration.
And while sodium is an electrolyte that helps with fluid balance in the body, excessive intake of sodium can cause increased thirst and increased urination and lead to dehydration.
The combination of sodium and sugar in the Gatorade can increase urination and lead to a loss of electrolytes and fluids and lead to dehydration.
And some people are more sensitive to the effects of the sodium and sugar in the Gatorade and so it makes them feel more dehydrated than other people.
The best drink to keep you hydrated is plain water, especially for shorter activities and workouts.
While it's okay to drink Gatorade when exercising, playing sports, working out etc you should still drink plain water along with the Gatorade and not just rely on Gatorade for hydration.
Also drink water before you're actually thirsty to prevent dehydration.