There are medical websites resources such as www.webmd.com or www.mayoclinic.com that might be helpful. However, your best option would be to check with your doctor on what he recommends.
http://www.mayoclinic.com/health/ulcerative-colitis/DS00598/DSECTION=lifestyle-and-home-remedies is an excellent article full of information on what to eat and what to avoid when troubled by ulcerative colitis.
The best person or persons to turn to for information on a colitis diet would be your family doctor or a dietician.They have the knowledge to point you in the right direction.
http://www.diet-i.com/ has information on TONS of diets. It tells you what the best diets currently are, gives you reviews of diets and even has a section for special diets.
To find places with advice on diets for diabetes, one should visit the official diabetes webpage. Alternatively, consult a doctor or medical specialist for advice.
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There is a website that offers advice about living with colitis called livingwithuc.com. Also, you will find treatment options at mayoclinic.org/ulcerative-colitis/. Webmd.com , Google health(health.google.com/health/ref/Ulcerative+colitis) and the Mayo Clinic all have extensive information on this subject. The Mayo Clinic's page is mayoclinic.com/health/ulcerative-colitis/DS00598
I would recommend talking to your family doctor. This is because he would be able to give you information on this. He would be able to tell you what you can do to prevent it.
When you are looking for foods with out colitis in them your best bet is for everydayhealth. This will give you exactly what you need to stay away from from day to day
WebMD and the MayoClinic will have advice on diets that work. Also you primary care physician will have helpful information. Basically, you need to reduce the calories you take in daily and increase the amount you burn.
There are great websites avaible with diet plans for individuals with colitis. One really nice website is http://www.colitisdiet.org/ They have printable diet plans that you can make grocery lists off of.
You can find recipes for diets on several sites. Try weightwatchers.com, webmd.com, of several other sites like jennycraig.com, for tips and cooking advice, along with recipes.
You can find it on a website named diet-i.com. It is a great website to learn how to stay fit and healthy.