Ah OP sorry you’re feeling disheartened! I’m the same as you, get all shaky if I miss a meal and absolutely could not cope on some of these diets. I put on weight during and after pregnancy but have managed to get it all off and stay very slim since without feeling like I have to restrict myself.
Everyone is individual though so what works for me wouldn’t necessarily work for you.
I have to have a big breakfast to get through the morning. Every day I have a large bowl of overnight soaked oats with kefir, fruit and toasted seeds and nuts. I switch up the fruit and nuts so I don’t get bored - sometimes peanut butter and blueberries, or cocoa powder and raspberries, or grated apple and cinnamon etc. I love it and it keeps me quite full. The nuts are essential!
I don’t eat anything until lunch but I do drink lots of coffee which fills me up (2 or 3 cups).
Lunch is also big - my colleagues often make comments like “where do you put it?” BUT it’s generally loads of veggies, salad, no ultra processed stuff at all, usually leftovers from meals cooked during the week. Once a week I bake a loaf of sourdough and have several slices of that for lunch with cheese on it (the smellier the better). But that’s only achievable because I have a day off midweek so I do lots of baking, roasting and meal prep on that day. Working full time it’s almost impossible to avoid processed foods.
Afternoon snack is usually fruit, kefir or my favourite - sugar snap peas! (I love them.) Sometimes something I’ve baked or a slice of sourdough. If I bake brownies I like to use a lot of nuts or chickpeas or beetroot or something to make it a bit more dense and filling and nutritious.
Dinner is always home cooked. Tonight was brown rice, miso glazed aubergines, omelette, and an assortment of veggies. I have 3 fussy kids so try and offer loads of different veg for every meal so that they all eat something. Today was peppers, cucumber, avocado, edamame beans, spring greens and grated carrots. Sesame seeds and lime juice to sprinkle on top. It’s not usually THAT many though!
But yes, it’s exhausting. And generates a lot of washing up!
We get a weekly veg box delivery so meals are planned around those.
I have dinner at 6pm and then generally don’t eat anything after that until breakfast. I’m a bit hungry as I write this but I know I’ll cope!
My general motto is to eat food that is delicious, filling, and as much variety (esp different plants) as possible. I aim for 20-30 different plants a day. This includes seeds, nuts, herbs, grains etc. I really really enjoy food and cooking is a huge part of my life.
I don’t drink much alcohol and I run, cycle and walk a lot as well.