Weight loss - no gallbladder

I had my gallbladder removed part way through weight loss, at age 59. Other than the anomalous period right after surgery, where water retention for healing made the scale stay high for a long time, I couldn't see that it made any difference in my weight loss rate at consistent calorie level. I didn't change my eating, except to put a few minor foods back in my rotation that had aggravated the heartburn from my gallbladder (it wasn't stones/sludge; it was this weird inflammatory thing called adenomyomatosis, which caused reflux & heartburn).

I was already eating fat on the moderate side, to reduce calories, so I didn't reduce it further after surgery; and I haven't had any digestive distress from consuming high fats occasionally more recently (surgery was 2015, age 59; reached goal weight later that year at 60; maintaining a healthy weight at age 63 now). I'm also hypothyroid (managed with medication) if that matters - I think it doesn't.

Obviously, if you have digestive sensitivity to fats now, you'll want to keep fats low. Other than that, I don't personally see any reason to do anything but manage calories, and strive for decent nutrition/satiation. I didn't use any particular predefined "formula" (low fat, low carb, whatever), other than just striving to feel full, and get decently well-rounded nutrition overall. Ultimately, I lost around 50 pounds in a bit less than a year.

I'm a believer in a "gradually remodel your way of eating" approach to weight loss and nutrition, and wrote up a description of that idea in this thread:

http://community.myfitnesspal.com/en/discussion/10636388/free-customized-personal-weight-loss-eating-plan-not-spam-or-mlm

In maintenance, I'm targeting 50g minimum fat (as much as possible from healthy sources like nuts, olive oil, avocados, etc.), 100g protein, 5+ (preferably 10+) servings of veggies/fruit daily. I don't pay much attention at all to carbs, but it looks like they're usually around 200g +/-. As context, most days, I try to come in around 1850 net calories, which is a bit below maintenance level, but eat more indulgently once a week or so to average out to maintaining my weight. For me, 1850 net calories is usually around 2000-2200 gross on exercise days.

Best wishes!