The phrase that sticks in my mind is "Losing weight is easy....just burn off more calories than you take in."
Ok, yes, there is something to be said about carbs, proteins and fats, but like a PP said, when you cut out carbs, you are effective cutting calories. I also found that rapid weight loss is a BAD thing. You really need to focus on losing no more than 1 pound a week. If you consistently drop 3-4 pounds over a few days, you will gain back 6-8 in no time.
I started my path to weight loss in 2008. I weighed 188 pounds so I started counting calories. This led to more healthy choices. I learned to love salad, tomatoes and spinach, all of which I previously shunned. A key for me was to give myself one day each week where I didn't count calories at all. I didn't go on a bender, but I ate dessert if I wanted it. This kept me from feeling deprived. I also learned that I could still have that 220 calorie Snickers bar...but if I went hungry later, it was my own fault. I quickly learned to substitute an 80-calorie vanilla Greek yogurt with a 90-calorie Fiber One brownie as my morning snack. It was 50 fewer calories and far more filling.
Over the course of 5 years, I had lost 35 pounds and got down to 153. I even trained for and completed the Wine and Dine 1/2 marathon last year. Since then, I have let myself go...stress eating, foot injury and no motivation have all led me to pack on almost 20 pounds

. So, I'm back on the weight loss train. I did it before and I can do it again. I know it will be slow and tough at times, but it is doable. I will be back to 155 by our trip in June 2016
