If I cosume only 700calories/day will it affect my health?

700?!?! I can burn that during a good trip to the bathroom. I'm well over that by lunchtime. How are you even upright?

My breakfast was almost 700 calories

jzammetti nailed it. The most immediate down side of sever calorie restriction is that your body will selectively hold onto fat tissue, and will instead burn muscle tissue to make up for the difference between caloric intake and the requirements of your organs and regular body functions. So while the *weight* will come off fast, your overall body fat % isn't going to shift as much as it would if you fuel yourself with a balanced diet. At the end of the day the goal is to lose *fat* not just pounds, for that you need to be eating enough calories to fuel your body, while maintaining a slight deficit and doing strength training and other exercises to maintain lean muscle tissue.

Long term, sever calorie restriction can cause organ damage. The effect of the body burning muscle tissue for fuel applies to your heart -> can cause serious heart related complication in addition to a myriad of other things.

I'd recommend checking out Fat 2 Fit radio's pod casts, and nerdfitness.com. Both sites have a lot of information about how to set goals to achieve fitness, health and body composition goals. At the end of the day, the important thing is to be strong and healthy. Starving yourself isn't the way to get there.

what are your recommendations

Eat more.

I don't want to alarm you but this is very dangerous. You could be setting yourself up for an eating disorder. That is the worst case scenario, if that doesn't sound serious you must not be aware of all the implications. It will not only impact your physical health, but it is a mental health issue as well a serious one.

Best case scenario, you lose the weight. Which it sounds like you don't have much to lose maybe 30 lbs. But, you have no idea now how to eat healthy how to add calories back in. Your body is angry now because you have been starving for several months. You have lost muscle tone, your metabolism is in the crapper. You may have issues with depression now, because you body is going to want to slow down to conserve calories and that will effect your mental health. But, since you have lost the weight you are motivated enough to see a doctor and get your health back on track, it will probably take a year or more, you most likely will not be able to do it, but you are highly motivated and you add calories back slowly and you learn to eat healthy and exercise and maybe that loose skin starts to firm up a bit. But, most likely you will gain everything back, bodies have a way of making you do things that you would really rather not do. The drive to eat is primal.

So since it will take a year or more to fix your health if you haven't done any permanent damage, why not take the time to do it right. If you have 34 lbs to lose 68 tops, then what is the rush. You aren't morbidly obese. You might not even be obese at your height. So, just being overweight not a huge deal. Most people in this country are 66% according to most sources. You are one of the lucky ones as a matter of fact. You can take control of your diet and your health now before developing serious issues like diabetes and heart disease. Shoot for one pound a week, two at the most. It's very doable, it doesn't have to be all that painful. But, you will have to make changes and gradual is better and will be much less a strain emotionally.

Add some fiber to your diet. Get a bit of exercise like an hour a day or at least a half hour. Cut out processed foods gradually and replace them with a homemade versions provided the home version is actually healthier. Switch from white potato french fries to sweet potato ones for one example of a healthier switch. Drink more water or herbal tea. But, what ever you do don't do anything drastic. Bodies don't like drastic measures.