I lost >12% of my body weight, without trying, over Christmas, in less than 3 months. I was peeing like a racehorse, frequently, waking up in the night to pee, sometimes twice a night. I don't think I had noticed increased thirst, but on reflection I had been drinking more than usual. If I had been asked, I wouldn't have said I was especially tired, but, again, on reflection, I had lost energy and I had perfected the art of falling fully asleep on the packed commuter train - ie, standing up - going to and from work. I had definitely noticed an increased hunger, so I was eating more than usual (and proper sweet stuff) but losing weight.
But then, I think I was diagnosed fairly early in type 1 progression. Even though blood sugars were 28 or something ridiculous I didn't have ketones. Even in A&E when I had a saline drip in I was told I looked too well to be in the hospital bed, or fighting to take the drip to the loo with me so I could do some more peeing.
I think that might be because they were comparing me to my mum sat next to me, cos she proper looked like she was about to have a heart attack bless her.
I didn't go to A&E because I was particularly unwell, I went because it was a Saturday afternoon and my well informed hypochondria had resulted in me testing my blood sugar with my nan's (type 2 on insulin) monitor and being told that I couldn't wait till Monday morning to see the GP with blood sugars that high, by nursing staff in the community hospital my mum worked in.