No diet for me, since I want to make sure it's sustainable for years to come. For me, that means including full fat dairy and sweets in appropriate portions.

I usually wind up between 1350 and 1550 calories a day; a typical day is cereal and milk for breakfast, a quesadilla with veggies or perhaps spanakopita (Greek phyllo triangles with spinach and feta, YUM) and/or a smoothie, and then dinner an assortment of meat or pasta and always a veggie if I can help it. Nuts, milk, or chips and hummus for snacks, and definitely a cookie or similar most days. I use the USDA supertracker site that keeps track of all my micronutrients and fruit/vegetable servings... trying to get all of those basically ensures I eat well.
For workouts it's a variety depending on what time of year. Usually I take ballet class every week, teach ballet every week on average, in the winter I ice skate every week, and then yoga (my current thing--every day for two weeks now!)/conditioning/weightlifting at home/stretching/cardio dance youtube routines. I'm pretty active (usually about 300 minutes/week), which is probably why I'm losing this fast at that calorie intake when the calculators say I shouldn't be.

The upside of spending so many years in dance is that I can't stand not feeling strong and flexible, and that means maintaining a high activity level.
What's Focus T25 and Piyo? Are they fun? I might check them out if they are; I HATE most forms of cardio so finding something else fun would be great.