Body and Soul: The Torah Path to Health, Fitness, and a Holy Life by Rabbi Alexander Seinfeld (Author), Dr. Daniel Grove MD (Author) is a good practical book about getting healthier despite being part of a culture and society that promotes overeating.
Because food and ritual eating is such an intrinsic part of Judaism, Body and Soul definitely has a market. Rabbi Seinfeld and Dr. Grove have written a very Jewish diet guide including typical, for many frum people, Shabbat/Chag menus, including what one noshes on at a kiddush. If you pencil in the calorie counts (from the guide at the end of the book) next to what you normally eat and then add it up, the chances are that you'd be horrified.
My most successful weight loss periods were when I kept a food chart, writing down what and how much I ate, plus the calorie counts. If you use a smart phone, that may be the best tool. There's probably an app which will make it easier. Rabbi Seinfeld and Dr. Grove also say that you really must know and keep track of what you eat. One of their tips is not to take second portions. For many people that makes a big difference in total calorie intake. And your total calorie intake is what's most important.
I would just like to add one of my suggestions. Simplify what you serve; make life easier and healthier. Don't give too many choices, because most people will try everything and eat more than they should. Serve just one carbohydrate. There's no reason to have both potato kugel and roasted potatoes. If you follow the custom of two and three kugel Shabbat, make spinach kugel, carrot kugel, along with either a noodle or potato kugel. There's no need to have three types of fleishik. One's enough, especially if you've started the meal with the first course of fish. Make lots of fresh salad and a choice of simple vegetables, no sugar/jam/honey added.
Body and Soul: The Torah Path to Health, Fitness, and a Holy Life is a very readable book and can really help people by opening their eyes and making them aware of what's in the food they eat. I recommend it as a very good start in improving one's and one's family's life and health.