Starting “eat right for your type “ O

Well, the Blood Type diet is bunk: http://skepdic.com/bloodtypediet.html. That being said, if you're eating less than you're burning, weight loss will happen. But it's going to happen regardless of what foods you eat to make up your diet.

I know this will be hard to believe, but---you don't need a diet. You just need to stay within your calorie goal everyday. It's simple, but not easy. You have to learn to eat for the rest of your life. Get a digital food scale, and weigh and measure everything you eat and drink. You'll quickly see which items are high calorie and which aren't. You'll want to do a mix so you'll feel satisfied. Everyone is different as far as foods that make them full. Stay within your calorie goal everyday. Try to move more, it's good for you, but it's the calories that will make you lose weight. Good luck. Once you get the hang of it, you'll be amazed.

Since you have had surgery and may have things to work around that Joe and Jane Average don't have, I would suggest seeing a nutritionist or dietitian to find a way to get your nutrients in a caloric deficit and avoid such issues as gastric dumping, vomiting, etc.