Technically, it breaks a fast but if you are fasting in order to eat less calories in the day, that 75 calories is not that big of a deal. A lot of people do this (dirty fasting) and still lose weight.
Some people fast to keep their insulin from spiking, so they would want to do a “clean fast” and not have that creamer and chocolate almond milk. Just depends on ones goals.
I’m kind of the way you are. I do 18/6 and 20/4 with my eating windows in the late afternoon and evening. But when I get up each morning I am so hungry! And it takes all my willpower to not eat. But somehow I’m making it.
I’m currently 5’1 and 47kg, so I’m already pretty thin naturally so it may differ from your expiernce but here’s just a tip I’d like to give
If you ever fail to fast for your selected amount, it’s alright. For example if your trying to do a 16:8 or a 20:4 and your a good way in but Fail, don’t worry it’s still working.
Because even if you failed you dieted for long enough that your body has at least lost more weight then it would usually, which in the end means you are succeeding. So don’t be sad if you haven’t reached your goals for 16 hours, because even if you did just 12, you’ve already burnt more fat then before. Even just trying your best helps.
What I’m trying to say is, if you fail, your still succeeding, don’t give up and keep on going, because soon enough you’ll reach the full hours and lose even more weight.