I enjoy a cup of coffee now and then but I do find that as soon as I drink it, I can feel my brain starting to shrivel up like a walnut. I know that sounds dramatic but I really feel coffee doing something to my brain almost immediately and I get the same effect when I drink alcohol.
When I became diabetic I stopped drinking milk. I'd more or less stopped drinking it prior to diagnosis as I found I wasn't finishing my cups of tea and I no longer liked the taste and didn't feel refreshed by it. Lo and behold I discovered from this website that milk is high in carbs and cream is a lot lower. I didn't fancy tea with cream at all so I took to drinking coffee with cream for my hot drinks but didn't enjoy it or the dehydration it causes me. Eventually I tried tea with cream and was ready to screw my nose up at it's taste and texture but wow! I love it and ask myself where has tea with cream been all my life? Why did I EVER entertain semi skimmed milk and even skimmed milk at times? My mouth hated it, my stomach hated and eventually my whole body hated it and 'forgot' to drink it.
Now I really look forward to my morning cuppa with single cream, I find it thoroughly refreshing and sometimes I have another one straight afterwards. I drink about 3-4 cups a day, morning and evening. During working hours I drink fruit teas or plain water.