Jenny,
Yes. It's a kind of fasting.
Unless you are a diabetic or have some other sort of health problem, fasting for a day shouldn't be a problem. You say you "don't get on very well." What sorts of problems are you experiencing?
My guess is that you are having troubles with your blood sugar levels. It's a very common problem with our modern diet. If you learn to keep your blood sugar constant, you do not get that hungry/shaky/sick/weak feeling.
Our appetite mechanism is triggered when our blood sugar falls below a certain level. When you eat carbohydrates, and especially highly processed carbohydrates, your blood sugar soon spikes. It then crashes well below its normal level. When blood sugar gets low, you start to feel very sleepy (the "carb coma"), then you get "the shakies" and feel sick. Your body will begin craving something high in carbohydrates in order to get your sugar level up quickly. You eat again and spike your blood sugar again and the process starts all over. It's called glycemic stress.
If this is your problem, your preference for oatmeal and bread on a fast is about the worst thing you could eat. You need to avoid carbohydrates (and especially highly processed carbohydrates) and stick to a low glycemic diet for a few days before you begin your fast. Fresh vegetables lightly cooked are my preference, especially dishes with lots of cabbage and onion and carrot in them. Or salads with a non-vinegar based dressing. An egg or a bit of cheese will help, too. Also, avoid diet fizzy drinks. I have found that most of the new artificial sweeteners will trigger a blood sugar reaction, at least in me. Ditto for alcoholic beverages, esp beer and wine. Avoiding coffee also helps, because caffeine exacerbates the blood sugar swings. Tea is much easier, but no sugar in it.
I respectfully disagree with my brother above about milk. Since the fat has been removed from skim milk, the naturally occurring milk sugars are more concentrated. You get much more sugar in a glass of skim milk than you do in a glass of whole milk.
If you learn how to manipulate your blood sugar and keep it to a healthy, constant level, it will make fasting much easier. I rarely feel bad or hungry when I fast. Even on an extended fast I rarely feel hunger after the third day.
Learning to keep your blood sugar constant will also help control weight and appetite at other times, and make you much less prone to diabetes. As a general rule I've found that when I eat carbohydrates, I have to eat the unrefined ones. Pinhead oats don't give me many problems. The quick cook oats do. Asian rice which is unrefined and takes 30 min to cook doesn't bother me much. Instant rice is terrible. Russet potatoes cause me problems. Red potatoes cause fewer problems. What you call "chips" and we call "fries" have the same glycemic index count as a candy bar!
Blessings,