How can we detect diabetes type 1 by its signs?

Increased urination: Increased urination and thirst with weight loss despite increased appetite the classic features.

3 P's: Polyuria, polydipsia, polyphagia urinate a lot, thirst, hunger, fatigue but diabetes usually starts months/years before with no symptoms; that's why routine screening needs to be preformed , especially in folks with family history of type 1 diabetes.