It can be confusing to choose a healthy diet. There are many books and experts telling you one diet is better than another. Your doctor can help you consider your options.
Remember, it's always best not to make extreme changes. Some diets that target weight loss, by limiting your diet to just a few items, or even just shakes, may not be the healthiest option for the long term.
Choose a balanced diet that looks good to you, that isn't too complicated to stick with, and you'll have long term success. And don't worry if you sometimes change your diet, as long as you are giving your body lots of nutritious foods, your immune system will thank you.