I did two sessions of an on line program called Precision Nutrition - lost 20% of my bodywieght the first year and maintained that loss for over a year. Probably going to sign up again in January (they only take people twice per year). Science based, food is up to you, no meal plans or counting calories, work out plans if you want or do your own. It had just the right amount of accountability and forgiving attitude that I needed. Personal coach for the year, plus real people support on facebook. They are all about changing habits, not doing fads or diets. You can get a lot of their info for free on their website. I lost 15-20 lbs between sign up and starting the program just from doing the common sense change of eating slowly. We know this, but who actually takes the time to make new habits?
Check it out, here are some popular infographics (ignore the ads) https://www.precisionnutrition.com/blog/infographics
The two things I didn't like were their contest (you can win a nice chunk of change, but the whole thing makes me uncomfortable as it almost seems to go against what the program is really about) and that the support groups are on facebook. I like the support group aspect but I don't like facebook. You don't have to use it but it helps if you have questions or just want to talk to others doing the same program.
Sorry to blather on, I think I just needed to talk myself back into the alumni group and to go back and access my info from before (you get access to the whole year's work for another year after, in my case I can still see both years together) it was a bit pricey, but for me not having any real support and in no way confident enough to go to a public gym...it really made a huge difference. I am so much healthier than I was in 2016 and considerably lighter too!