Having lost ~75 pounds and having (mostly) kept it off, the "trick" is to stop eating certain foods, sleeping well and exercising.
Start by avoiding any sugars whatsoever (exception: fresh fruit), bread, fried food. This will be difficult for a few days to a week, but afterwards it gets easier and easier. You will end up consuming less food. Do this diligently, as even one chocolate might set you back by increasing desire for sugar.
Exercise by first walking and the running, depending on your level of fitness. Lifting weights also helps because it increases metabolism. After running, you may crave apples or bananas, both of which are very good.
What's your go-to replacement for bread? I'm a bit fan of bread (brown / whole meal bread), it's a filling, slow release and (not unimportant!) cheap source of carbs, which you need for regular functioning. Going "no carb" is extremist and can be dangerous long term. Balance out the macronutrients first, then start adjusting a little in favor of protein.
A lot of people eat a ton of bread, which ends up being a ton of calories. Then they miss a lot of nutrients, so they will have weird cravings for other things. It's not necessarily that bread is bad, it's just that excluding it means you start thinking about "ok, so what do I eat". For some people this is useful.
While losing weight, I would not replace it, but simply remove it altogether. Bread is not an essential nutrient (although obviously French baguettes are great tasting). You can get plenty of carbs from other food (e.g., fresh fruit).
Start by avoiding any sugars whatsoever (exception: fresh fruit), bread, fried food. This will be difficult for a few days to a week, but afterwards it gets easier and easier. You will end up consuming less food. Do this diligently, as even one chocolate might set you back by increasing desire for sugar.
Exercise by first walking and the running, depending on your level of fitness. Lifting weights also helps because it increases metabolism. After running, you may crave apples or bananas, both of which are very good.
Sleep well, it helps the body recover.