Having recently been diagnosed as prediabetic, I have read a lot of books on diet and diabetes and this was probably the most pragmatic and useful. I liked the fact he is a British GP, so it felt relevant to me. There is so much conflicting advice on the "best" diet for putting diabetes in remission, but Dr Cavan was not as dogmatic as many other books - he looks at lots of different approaches and emphasises that the best diet is one that is sustainable for you.
He does generally advocate a lower carb approach, because it just works. Be aware that NHS guidelines + Diabetes UK are quite ambivalent about low carb diets, emphasising low GI - but it is clear that a diabetic body just can't handle carbs well so why fuel the fire? How low carb you need to go is very individual - you may find a few tweaks are all you need to make and Dr Cavan talks you through medication changes you may need to discuss with your doctor if you are on blood glucose lowering meds.
Diabetes does not have a short-term fix - at best you can put it in remission, so the focus is on making lifestyle habit changes in a sustainable way, whether that is reducing carbs, reducing snacking, skipping breakfast, strength training etc. There is no one-size-fits-all approach, which if you like a set meal plan you may not like - but I think it is better to make long term habit changes that suit you and your preferences.
For me reducing my carbs and upping protein and veg has got me off the blood sugar roller-coaster so I am no longer starving at 4pm or needing sugar to pick me up, and eating a late breakfast is easy for me. I don't particularly count calories or carbs and listen to my body and eat a bit more if I am hungry. Sleep, stress management & exercise (walking daily, occasional runs & for the first time, weights) are also part of the picture. I am losing weight and inches for the first time in years and it feels sustainable. Thank you, Dr Cavan - I was so confused after reading so much conflicting advice and despondent that I found the 800 calorie approach too restrictive. It is a relief to find an approach that feels doable long-term and is working.