I'm following a plan called Dax Moy Elimination diet. Here's a link www.kettlebellfatlosstraining.com/pdf/eliminationdiet.pdf
I've not found it hard in the slightest and my meals are lovely and I have rediscovered my love of cooking with fresh ingredients and being a bit inventive too. I think it is highly sustainable as a long term lifestyle change rather than just a diet.
Here's my food diary, I've also been keeping one for the last 5 weeks and it's really helped I think
Breakfast - porridge with oat milk, a smoked mackerel fillet for protein
Snack: a Nakd bar
Lunch - Egg, ham, salad, dressing of olive oil, s&p, balsamic. A plum.
Dinner - Beef, courgette, peppers, onions, in a spicy parika/bbq sauce with roasted courgette, butternut squash and carrots.