I agree with everything KD said. I am not overly tall and I have never had what one might call a 'fast metabolism'. Low carbing has helped me to lose ten stones and keep them off. The last few pounds are determined to cling to me but they, too, will go eventually.
I follow Vegetarian Atkins and I most certainly DO have to consider calories. I don't count them obsessively but I keep an eye on them, as my body cannot tolerate large amounts of food and still lose weight. Much of this is just common sense. The more weight we have to lose, at the very beginning, the more we can eat, but this early loss quickly slows as it does on any 'diet'. It is unreasonable to think you can eat 2,000 to 3,000 calories every day and have weight simply fall off. The human body doesn't work that way. Not unless one is a marathon runner or is working out for hours and hours daily. Or digs ditches for a living! Men, of course, have always been able to eat more than women and still lose faster. That may seem unfair but it's just how it is. They can eat lots more when maintaining, too!
I am thrilled with my weight loss. I regard myself as a 'success story'. Jim here has lost even more than I and is maintaining comfortably! However this does not mean that it was always easy and plain sailing. I have had several long stalls and indeed am in the middle of another one right now. I haven't lost weight since January. But I am eating well and healthily and despite one or two slips I am still on plan. I hope to get to goal and stay there, indefinitely. Only Atkins can promise me such a long term result. If I do my part the plan will do the rest.
To those who dream of fast losses I can only say, they are usually achieved by severely limiting calorie intake. I've been there. I used to starve and yes I did get very thin but I couldn't keep the weight off and I was very weak and unhealthy. Now I eat good natural food in moderate amounts, adjusting as I go, adding new foods and subtracting others that seem to affect me badly. This is a very individual way of eating.
We all yearn to lose weight as quickly as possible and that is not always the best way, far less the way we can stick to, longer term. Impatience and disappointment can sabotage you before you even get properly into your new way of eating.
Love and luck to you in whatever you decide to do now but at least think it over. This is a good way to live, not just to diet.