Might somebody have celiac disease and diabetes?

Yes. It is a known association of type i or childhood onset diabetes. About 10% of these types of diabetics also have celiac disease. Adult onset diabetes is caused by a different mechanism, and is not related. However, it is possible to have the 2 conditions together.

Related Questions

Is there a connection between celiac disease and diabetes insipidus?

Autoimmunity. Some diabetes insipidus is caused by a condition which is called hypophysitis (pituitary inflammation) -- which is sometimes autoimmune. Celiac is an autoimmune disease. Individuals with one autoimmune disease are more likely to develop others. This would be a somewhat uncommon explanation and there is a good chance that the two are unrelated. Read more...
No. None that I am aware of and I could not find anything significant in a quick search. Type 1 diabetes and celiac are more common together, but not diabetes insipidus. Read more...

How would you suggest that a six flags trip be managed with type 1 diabetes and celiac disease?

Preparation. And planning. Make sure you think of the details, such as travel, hotel, meals, medication, monitoring equipment, treatment for hypoglycemia if it occurs. Check out places to eat on the internet in advance or take your own food. Many places offer gluten free food these days. It's all in the advance planning and preparation. Diabetes nurse educators can help you with the details. Read more...
Unclear. I am not sure I understand your concern. Everything should proceed as normal. For the celiac disease traveler you might pack food to guarantee you know what is in it. Read more...

Can sickle cell trait have an impact on other health conditions such as type 1 diabetes, neuropathy, high blood pressure, celiac disease, or asthma?

NO. Is a trait, one abnormal gene, you need 2 abnormal genes to cause sickle cell disease. In extreme cases with low oxygen red cells can break when they change shape (sickle). Read more...
Maybe. Sickle cell trait can affect other organ systems. The kidneys seem to be the most often affected though not always. For that reason make sure to control your blood pressure well if that is a problem so as not to add to the kidney issue. It would not directly interact with the other conditions mentioned. Read more...