Regarding weight lost, I am not a doctor or a nutritionist, just a guy who was an overweight teenager and who has to be careful with his weight. My whole genetically related family except for my mom who is 74 and had 3 cancers is very overweight to morbidly obese, so I know what not to do: I just look at my family and at my past. My mom is not healthy at her weight, but multiple rounds of chemo wrecks your body. If you go on a weight loss journey, here are a few observations that I hope will help you:
1 - Nobody knows how to lose weight easily. Otherwise, everybody would look like a model. Yet, I would seem that everybody has an opinion on what you should do. Note that all these people will contradict each others. Some will tell you to go plant based, others will tell you to eat mostly meat. Both will tell you their way is the only way to go. However, there are skinny people in all cultures. Many Chinese people are skinny and they eat a ton of carbs (rice!), which is for others enemy number one. People on this forum like meat. It's a good idea for their goal as you can build muscle more easily with more protein. Gaining muscles is very difficult on a plant-based diet. Probably not impossible, but you will have to be careful about what you do. On a meat based diet, you just have to eat meat everyday. Easier. My preference is also meat by the way. Steak is my favorite food. Way above chocolate cake. However, this is just my opinion. My wife likes more variety and will eat vegetarian a few times a week. Yes, this means that we often don't eat the same thing, even at home. I will have meat and she will have chick peas or tofu.
So what to do? My opinion is: try something and see if it works for you. Just like the best exercise plan is the one you stick to, the best weight loss program is the one you are comfortable with. Some people like low carbs, some people like intermittent fasting, others like to count calories. Pick one that looks good, try to implement it, put an item on your calendar to reassess in a few months. If it worked, rinse and repeat. If it does not, try something else.
2 -Science seems to say three basic things:
A - Losing weight slowly seems to be much preferable than losing weight quickly, as quick losses are often reversed within a few months/years.
B - To lose weight, your body has to expend more energy than it absorbs through food. This is thermodynamics. While this seems straightforward, doing it is difficult, and it is extremely difficult to know exactly how much energy you spend and how much you get through food. This is the kettlebell forum, so I will not go into details, but if you use an app, be ready to have very high uncertainty in the numbers. Apps are probably OK to track differences across time, but not absolute number. In other words, if the app says that you ate 2000 less calories than last week and spent1000 calories more through exercise, you probably ate less and moved more than last week. However, the real number may be very different from 3000 calories difference.
C - Refined sugar is bad for weight loss. Really bad. It does not fill you up, contains a lot of calories, and can be consumed in large quantities easily, especially in liquid form (sodas, etc...).
3 - My experience: going to sleep hungry is a bad idea. You will not sleep well. If you finally decide to wake up in the middle of the night to eat, you will make bad choices.
4 - Many use food and drinks for comfort. If you have a tendency to eat to comfort yourself, to reward yourself or drink a lot of alcohol, solving the underlying problem is necessary.
5 - This is a long process. If it took 10 years to gain the weight, losing it in 3 months will be almost impossible. What is needed is basically a lifestyle change (permanent), not a diet (temporary). That's why it's important to choose a method you can live with.
6 - Getting in shape is a very good idea (both cardio and strength). You can spend more calories when you can run instead of walking and lift 400 pounds instead of 200. Getting in shape is also a long process, depending from where you come from. You seem to have a good idea with S&S (here we are, at least some forum-related content!
).
OK, that's already long enough. Good luck on your journey. It can be done.