I decided I want to lose some fat recently and get a bit healthier. To give myself goals to go for each day I'm using a calorie monitoring app which recommends I have 1750 calories a day. At the moment I pretty much do little to no exercise apart from the occasional day where I go swimming or I am traveling to visit my girlfriend, I do notice that on those days I tend to eat more as I feel more hungry and usually hit around the 1750 mark, varying around 200 calories either way. Although on a usual day I have about 400 calories less averaging around 1200 calories a day.
stats Male age: 21 height: 5,7" starting Aug 18th 185lb now(Sep 1st) 178.5lb (stopped drinking fizzys, eating out less and avoiding comfort foods)
On a day where I might go out for a meal I have sometimes gone over up to about 2000 calories, but this is quite rare. What I wanted to ask is, is the inverse acceptable? i.e. today I have only had 800 calories, although I don't feel hungry or anything, but it does seem very little to me. Could this be bad for my health? If I eat so few calories, will I burn off muscle or get ill easily from lack of nutrients?
What are the negative side affects from having a very low-calorie day once in awhile?