Dieitng and light headed?!

Dieitng and light headed?

I have a question about diets and calorie intake. I'm dieitng at the minute but have been having trouble getting up in the morning and have been tired and light headed most of the day. I usually eat a piece of fruit or 2 for lunch and then a low fat meal (such as a tuna steak and veg) for my evening meal. My family are convinced that this is too little and I agree it's been a drastic reduction but it's not like I've stopped eating altogether. I've already stopped being hungry and I often can't finish my meals so when will the tiredness go ?

when you deprive your body (which you are doing) your body doesn't get energy and nutrients it needs for normal functioning. any rapid weight loss is mostly water and muscle loss. it can also cause fatigue and dizziness, with less energy for physical activity. and it feeds the cycle of yo-yo dieting. body chemicals called ketones build up in the body when carbs are not available for energy which is really bad for kidneys.
(ketosis - increased blood ketones from incomplete fat breakdown. it suppresses hunger and so contributes to lower calorie intake. ketosis can cause weakness, nausea, dehydration, light-headedness and irritability. it can be fatal to people with diabetes.