dizzy spells due to low calorie intake?

Don't assume a dizzy spell is a lack of net calories (though it could be). The same could be caused by dehydration or an imbalanced diet.

First, talk to your doctor to make sure there are no actual problems. It's reasonable to eat a little more quality food and drink more water and see if it goes away, but don't spend a lot of time self-experimenting resolving dizzy spells. (to OP: Yes, you've done this, and good job!, this is just more informational).

Second, make sure you are drinking a reasonable amount of water. Skip the numbers and the slogans. In a normal healthy person, your urine should be pale yellow. If it's clear, you're drinking too much but you're good unless you are drinking A LOT of water (more than a couple gallons a day).

Third, check your fats, proteins, and carbohydrates. Make sure you are eating a reasonable balance of all three. Keep sugars to a reasonable minimum. Make sure you are getting iron, potassium, and sodium and not ridiculously overdoing any of the three. Check your other nutrients occasionally to make sure you are getting enough of each. It's OK to take a multivitamin/supplement if you're struggling with them and can't get it through food easily - just pick the multivitamin that gives you what you need and doesn't give you what you don't.

Finally, remember that a couple hundred calories a day will slow your weight loss but aren't going to do you any real harm, so if you're otherwise healthy and you've gone through the above, eat a little more and see what happens.

I drink a ton of water

Not good for you at all!! Only drink what you need NOT what you think you need as this can be dangerous.

Well as it was over a year ago she's had time to sort it out by now

Holy Necromanced Thread, Batman!

thats another good point, once your caloric intake hits a certain bottom point, your body goes into survival mode and starts hoarding every calorie it can get its hands on.

So much misinformed well-intentioned advice on these boards...

Contrary to what has been said, you CAN NOT go into starvation mode by lowering your calories like that... That is not how the body works... In fact, for most of us - a 20 day fast would not put us in starvation mode until we hit close to 7-8% bodyfat.

Go research any of the IF authors and see their sources. These guys have to deal with this "but what about starvation mode" comments all the time. I've dropped my calorie intake to 1500ish per day & my TDEE is around 2800. All that means is you need to chose your calories wisely and make sure that you consume nutrient dense foods opposed to nutrient weak high carb foods that makes you hungry & knocks your insulin levels out of wack.

Research actual starvation mode & make sure you're not reading articles from ppl on this site, or from people who don't know how to properly read & comprehend peer reviewed studies on starvation mode.

Thank goodness for a bit of sense! I am SOOOOO fed up reading about 'starvation mode' on this forum, it's a myth.

Blood pressure measures the strength of the heart contracting...

Not exactly...blood pressure is the force of blood against the walls of arteries.

40 years ago I started out T 335 lbs went on a strict 800 calorie daily diet, working out at least an hr a day, 15 months later I was at 170 lbs & feeling great! Not once did I have a faint feeling. NOW 40 years later I found myself at 242 lbs Feb 1 exactly 40 years later. So I decided it was time to get back in shape so I started the same ͏Di͏e͏t again and after a month I’m down to 224.8 lbs , but I can’t seem to shake the light headedness. Then made a crucial mistake giving blood yesterday faintness was only a step away. Man what a difference 40 years makes, but have to get it back in shape so I can leave a good looking corpse, just kidding. But I am gonna have to balance my calories during the day