You kind of need the reward of seeing changes in order to motivate you on what at first seems a difficult journey, but which then turns into a way of life. For the first time in 5 weeks my weight loss seemed to have stalled at the weekend, so I can empathise. So far ~ 18lbs lost. When you weigh yourself, levels of dehydration, how long after meals etc makes a difference.
With respect to food I’ve shifted from excess carbs to avoiding them where possible in order to try and burn fat for 8 weeks.
I now really enjoy the crunchier and tastier way of eating and have felt 100% better since day 1.
I would endorse drinking LOTS of water, I try for 2 – 3 litres per day extra to other drinks. It seems to help your body adjust.
My favourite breakfast was porridge but have skipped for BSD, as its pretty calorific and carborific, although still on the good side of the fence. Instead I have proper Greek yogurt which is filling with berries etc. The rhubarb recipe in the book is also surprisingly nice. Add a small amount of linseed/nut/gogi mix [Aldi] and a couple of spoonfuls of chia seeds. It’s worth reading about the latter to see how good it is for you [Omega 3s etc] and the seeds also swell and make a small bowl of food into a filling brek – good for digestion too. I also exercise and burn 800-900 cals three times per week. If desperate for a sweet-ish snack on those days I have celery with peanut and almond butter [in the past that would have been toast and peanut butter/banana] and occasionally some fruit. A spiraliser helps – substituting courgette etc for pasta.
Good luck – commit to the 8 weeks and trust in the process.