Eating too little will slow down your metabolism, and can eventually cause weight gain, however that is after you resume eating more calories again. While you are eating say 900 calories, you will lose weight. You don't stop losing due to too few calories, you just make it easier to gain weight after you resume your regular diet. People fast and lose weight all the time. Less calories will lead to more weight loss. It seems that people are confused as to what is meant by "starvation mode ".
I ate 1 meal a day the summer after I graduated, probably less than 500 calories a day. I went from 317 to 183 in one summer. Weight loss will happen if you cut out calories. The slowing of your metabolism hurts you when you resume eating say 1600 calories, and now are burning 1100 a day, instead of 1250 a day. You don't use that extra 150 calories. So now you resume gaining a lb a week like you did before the diet, but add an extra 1 lb every 24 days ( 150 X 24 = 3600 calories ). You are re-gaining weight faster after you starve yourself.
If you are eating 900 calories, and burning 450 a day through exercise, then you will lose weight. We all burn more than 900 calories even if sedentary. Our metabolisms don't slow down THAT much.
I just wanted to point that out. It seems that many people are using " starvation mode " as the reason they are not losing, when it is something else entirely. So they aren't bothering to take a second look at their diet, and find what the real problem is. If eating less caused us to maintain weight, then fasting and anorexia would not cause weight loss.
To the OP: 104 at your height is a BMI of 19.0. I am not sure if this is healthy or not, but is very light. I would consider that it might be a goal to lift weights, and firm up, instead of become skinnier. Changing the composition of your body might give you the results you are looking for, while dropping 15 lbs. might not, and if not, then you can't safely lose MORE weight, so what do you do then? I have been 180 while lifting weights, and playing sports for hours a day, and 180 when I finished starving myself for 4 months, and losing 134 lbs, and I didn't look the same at all. In the first scenario, I had abs showing, and was muscular. After losing weight to achieve 180, I still had flab around my stomach, and no muscle. I had a 34" waist, but still looked fat without a shirt.
If you still decide to lose the 15, I would suggest that you pre-plan your diet, so you know what you are going to eat when you wake up, and click on your tracker. That way you never get to dinner, and find yourself 1000 calories short. At this point, just eat a regular dinner, and plan tomorrow. One day low on calories won't make a difference in the long run.
Russell - current BMI 28.6
197 - bmi 30 - done
164 - bmi-25
| current weight: 183.4