Why is it that fruits and vegetables make my stool hard instead of soft?

I’ve always been told that vegetables and fruit have fiber in them and make you regular. However, I always usually get constipated after eating vegetables or fruits. I don’t drink much water though. 1 glass a day. What this have anything to do with it? Plus, do I still need to drink water along with fruits and vegetables to make myself regular and not constipated. I eat greasy foods and then I’m not constipated explain this please?

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    can eating a lot of fruit make your stools green , why do vegetables make me constipated? , why are my stools hard when I drink alot of water , why after eating fruits I shit a lot , what fruits and vegetables make you poop , what can u eat to make ur stool hard , vegetables that clear your bowels , my colon does not absorb fluid to make stools soft , I get constipated when I eat a salad or fruit Why? , i eat only fruits and vegtebles drink water and still constipated