Fluctuating Stool Consistency with Colostomy: Concerns?

I have had a colostomy since Sept 18.  In the past week, every day I have really fluidy stools one time, and another time of the day it is not really loose.  Any ideas?  Should I be concerned?  I have not noticed any items in my diet different.  I do tend to have the very loose or should I say just liquid just after dinner time.  I am not stuffing myself at dinner either.  
Thanks for any advice.

I don't have a colostomy but an ileostomy, and for the first couple of years, the only consistency was a lack of consistency. My diet remained the same for the most part, and I chalked it up to my body getting used to a new way of adapting to a new learning curve. But even ten years later, I still have spells of very watery discharge, and after a while, it comes back to normal, which is still very loose, but that is the best I can expect. I don't know if this helps, but we throw it out there anyway, good luck, Ed.

I had my colostomy since may2012 and also still learning to live with it and learning what food is not so good for my stomach/ intestine. I found that after my stoll started to become harder, i was having very loose output. I realized that because I am in a hormonal suppresant and I had been gaining weight i had supressed my intake of bread.
Now i would have a piece of bread like sandwich or with the meal, and i found my stool has gone back to be more formed.
Things that before I would not have problem eating, now I have to be carefull, like lettuce, sugary  cereal, etc. specially at night.
Also I add some baby oil to my bag and that helps the stoll to drop to the bottom keeping the bag cleaner. I use a hollister two piece.
Hope this helps.