fat uro

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Yes i know uros are usually pretty fat as it is, but my uro gained a lot of wait in about a month. I thought at first that he might be constapated so i soaked him in warm water for a few minutes and he acutally pooped. But now i really don't think that's the problem. His stomach just feels like a squishy balloon. I talked to the pet store lady that i bought him from and she said it might be due to the types of foods i'm feeding him. He really enjoyes green beans, peas and dandilion. She told me to feed him more leafy greens like kale and collard greens. What do you all think? Is this normal? I'm going to try to feed him different types leafy greens and see how he does with that. Any other suggestions?