For maintenance I think the feast/fast/famine cycle would be very difficult to keep up. There is no way I could follow this long term because I would be always thinking about food, being too hungry during the week and impatiently awaiting the moment I could eat as much as I wanted on the weekend.
I am no expert but I would suggest you find a diet that is more consistent from day to day. For sure some days you are going to eat more than usual and that is to be expected, and you will probably cut back a bit to compensate on the following days, but I think it would be better if you can find a way of eating that does not vary so much.
This thread is about how to eat after achieving your target weight/blood sugar level, and it needs to be a way of eating that you can follow for the rest of your life. Of course everybody is different and your way of eating may be the easiest for you so I should just shut up, but if you do find it a struggle, try to set a consistent daily diet following Dr Mosley’s guidelines. They are the basis of a healthy way of eating that you can follow for the rest of your life. I hope he doesn’t mind my posting a summary of them here.
Cut down on sugar, sweet treats, sweet drinks, and sweet desserts. Once a week or less.
Minimize or avoid the starchy white stuff. Avoid white bread, pasta, potatoes, and rice. Brown rice is okay. Other good choices include quinoa, bulgur (cracked wheat), whole rye and barley. Lentils and beans are healthy and filling. Read labels to make sure you are not getting sugar.
Avoid breakfast cereals. Oatmeal is good, as long as it is not the instant sort. Quick is fine.
Full-fat unsweetened yogourt is also good. For flavour, add berries or nuts.
Start the day with eggs. Boiled, poached, scrambled, or as an omelet, eggs will keep you fuller for longer than cereal or toast.
Snack on nuts. They are a great source of protein and fiber. Try to avoid salted or sweetened nuts, as they can encourage you to overdo it.
Eat more healthful fats and oils. Along with oily fish (salmon, tuna, mackerel), consume more olive oil. A splash makes vegetables taste better and improves the absorption of certain vitamins.
Use butter instead of margarine. Cheese in moderation is fine.
Choose high-quality proteins. Top choices include fish, shrimp, chicken, turkey, pork, beef, and eggs. Other protein-rich foods include soy, dry beans, Quorn meat substitute products, and hummus. Processed meats (ham, bacon, salami, sausage) should be eaten only a few times a week.
Eat plenty of different-coloured vegetables. Mix it up, including everything from dark leafy greens to bright red and yellow peppers, all the brasiccas, all the root vegetables, etc.. Saute your veggies with mushrooms, onions, leeks, tomatoes, peppers or any and all combinations of those, and add spices too. Nutmeg is good on cauli. Mash up a mixture of root veggies with a bit of pumpkin pie spice.
Avoid too many sweet fruits. Tropical fruits such as mangoes, pineapples, melons, and bananas are full of sugar.
Drink very lightly, average one a day or less and try to avoid beer.
Of course in the book these are explained in much more detail. If you stick to these guidelines while eating moderately you should be able to maintain your weight indefinitely and be confident you are eating healthfully.