I was also overweight before I got ill, and then lost 55 pounds while ill. Now I follow a full elimination diet, so my diet is quite strict. Several things have helped me with this regime so that I maintain a healthy weight and also so I don't become ill again.
First, I have the attitude that food is like medicine for my disease; if I want to stay well, I must eat what helps me to stay well in the amounts that are helpful to my body--so a committed attitude is number one.
Second, mostly I weigh and measure all my food. This helps me to eat a balanced and nutritious diet as much as I am able to. I, too, would like to eat salads and lots of vegetables (especially raw ones!), but I have had to accept that I can't. So, acceptance of my limitations and keeping track of everything that goes in my mouth is important.
Third, I take a lot of time researching and then purchasing healthy good food and then creating healthy good meals with it when I get home; it has become a lifestyle for me.
Fourth, I always have my next meal ready. I have to eat small amounts frequently, and because my diet is still really limited, I can't just grab something when I am out. So, if I'm at home, lunch is ready in the fridge-- if I'm out, it is with me packed with an icepack or kept warm in a thermos. I know what I am having for dinner each night and it is either made the day before or already prepped to be cooked quickly, so I don't eat something I shouldn't because I am hungry when I get home.
Fifth, I have trained myself to eat and enjoy most things low-fat and unsweetened and to use fresh and dried herbs, stock from cooked and roasted veggies, and cooked fruits to add flavour to foods. I also leave room for small (measured) amounts of treats that I can tolerate. This way I get to really enjoy the healthy food that I prepare and the occasional treat, knowing that I will stay healthy while enjoying it.
All of this being said, I still know the struggles of moderation. Two weeks ago I was food-testing corn products (not the vegetable itself, but cornstarch, meal, syrup etc.) It can take up to a week for symptoms to appear while testing grains. Well, the week was going well and I was enjoying cornbread (first type of 'bread' that I have had since August!), puffed rice squares (syrup,) chicken pot pie and wheat and dairy-free choco zhucchini cake (cornstarch). I overindulged in it all, because it was sooo good and such a change from my usual rice and quinoa based foods. So, when the seven days of this came to an end, whammy, I was sick--the worst I've been in months. And now I am not sure if it really is the corn-based foods or just that I broke all my rules and ate too much of everything and my digestion could not handle it all.
It probably was a combination of the two, but now I won't know until I test again (sigh), and I won't be testing corn products again for a long time!
Fortunately, I am better again (yay!), but apparently, I still need reminding of what my body does and doesn't like. So, humbly I go back to measuring rice and quinoa and veggies and soy milk and chicken and non-dairy chocolate (oops)--well, I gotta enjoy life.
Good luck on your journeys to a healthy weight. :goodluck: