Why does feeding less greens and other wet foods improve a guinea pigs digestive health more than feeding more hay?

Reducing the amount of greens and other ‘wet’ foods your guinea pig eats is more effective at improving digestive health! It is even more effective than feeding more hay. Why? because even if there is ample amounts of hay eaten (supporting the slow growth of good bacteria), bad bacteria can grow fast on the ‘wet’ foods your guinea pig eats (like greens and veggies) and cause digestive problems.