So, what did you do to lose the weight? How do you deal with the hunger? How do you keep it off?
Hunger only lasted for a week or two. Maybe three weeks.
At the end of the day it's like this. Our bodies use a certain amount of energy (expressed in calories) every day. You can actually calculate this number (look around online) based on age, weight, and height. The more you weigh, the more calories your body uses. That's why people have a hard time with dieting. They go from eating 3500 calories a day to 1200 because some diet book told them that was the magic number. In reality, for them, 1200 might be a dangerously low number. When they could actually lose 2-3 pounds a week eating 2600 calories a day! (Just being mindful that as they lose, they'll need to re-calculate and adjust that caloric intake number, I do it every 5lbs lost).
So once you've figured up your "metabolic rate", the amount of calories you burn in a day, subtract 500 and eat that. So if your metabolic rate is 3000 calories, eat 2500 calories a day. The result is a loss of 1-3 pounds per week.
Stay away from tons of carbs (some are fine, but eating carbs with every meal isn't), trans fats (fried foods), excess sugar, and definitely stay away from diet sodas, "fat free" stuff, and other such nonsense that uses unhealthy sweeteners. I drink water, unsweet tea, or black coffee usually. You develop a taste for these things, after a few days (all it took for me to switch from wanting sweet tea to preferring regular tea was drinking regular tea for a few days).
Write down everything you eat and lookup the calories. EVERYTHING has calories except for water, so look it up! Some fruits and veggies for example, are very high in nutrition, but high in calories too. Bananas, grapes, blackberries for example. All good for you, but you need to write them down and look up their calories because you need to make sure you don't exceed your goal.
If you get hungry, drink water. And especially in the first few weeks, eat a lot of high-density low calorie foods (lettuce, bison, turkey, lean chicken, spinach, etc.) You'd be amazed how big of a meal you can make with just a few hundred calories. Soups are really filling too. I just had some chicken noodle soup for lunch that was 150 calories (soups are usually high in sodium; but that's okay once in a while. The trick with all of this is to just not eat the unhealthy things ALL THE TIME and to find balance). Force yourself to drink a LOT of cold water. The cold water takes energy to process (your body has to warm it up, too), and also being well hydrated (most people aren't. If you aren't peeing clear every time, you aren't hydrated!) improves the efficiency of our bodies. Plus, drinking lots of water curbs hunger.
So that's what I do. Write down and look up everything I eat, I measure portions with a scale, and I take in 500 calories a day less than I need. Occasionally I'll overeat a meal, but I plan it. For example, a few weeks ago I had a burger. A GOOD burger. The kind of burger they serve at a historic bar with jalapenos, barbecue sauce, fried cheese strips, smothered in melted cheese with fries on the side. I had fruit for breakfast, and a real light lunch. Even so, still went way over on calories; but I wrote it down and was very strict for the next couple of weeks!
It's more about how many calories you take in in a WEEK than it is about how many calories you take in in a MEAL.
Also, exercise helps. I don't spend hours at the gym, but I do park in the back of the parking lot, walk fast everywhere I go, do 60 pushups and situps a day and other little things here and there to keep my body moving (since I don't work a physical job).
Eating more nutrituous food helps too. Most overweight people are malnourished! I know I was. Looking back at what I used to eat EVERY DAY, I wasn't getting the nutrients my body needs.
It's like taking care of the bike. Put in what it needs, not too much, not too little, and she'll run well for a long time.