Here is a breakdown on the strawberry shake (in the product details dropdown)
http://www.exantediet.com/diet-products/meal-replacement-strawberry-shake/11118436.html
At 17 carbs per shake it would be too high for me but good luck and let us know how you get on
Nutritional Information Per 100g Per 51g Serving % RI Per 51/100g
Energy kJ 1660 847
Energy kcal 392 200
Fat (g) 13 6.6
(of which saturates) (g) 6.1 3.1
Carbohydrate (g) 33.6 17.1
(of which sugars) (g) 27 13.7
Fibre (g) 8 4.1
Protein (g) 34.7 17.7
Personally I wouldn't eat this fake food. Here's what's in it:
Skimmed
Milk Powder (42%), Vegetable Fat Concentrate (Refined
Soybean Oil, Maltodextrin,
Milk Proteins, Emulsifier (
Soy Lecithins), Antioxidant (Fatty Acid Esters of Ascorbic Acid, Alpha-Tocopherol)), Whey Protein Concentrate (
Milk),
Soy Protein, Vegetable Creamer Concentrate (Refined Coconut Oil, Whey Powder (
Milk),
Milk Protein, Stabilizer (Triphosphates Acetylated Oxidised Starch), Free Flowing Agent (Tricalcium Phosphate)), Maltodextrin, Inulin, Potassium Citrate, Natural Flavouring, Emulsifiers (Xanthan Gum, Guar Gum), Colour (Beetroot), DI Potassium Phosphate, Salt, Calcium Chloride, Magnesium Oxide, Vitamin Premix (Biotin, Chromium, Copper, Fluoride, Folic Acid, Iodine, Iron, Manganese, Molybdenum, Niacin, Pantothenic Acid, Selenium, Vitamin A, Vitamin B1, Vitamin B12, Vitamin B2, Vitamin B6, Vitamin C, Vitamin D, Vitamin E, Vitamin K1 And Zinc), Sweetener (Sucralose).
I've seen that a few people on the forum have done the 800 calorie a day diet using real food with good results. I think the original Newcastle diet used the shakes because it was a science experiment and they wanted the subjects eating as similarly as possible and this was an easy way to do it. And the meal replacement manufacturer supplied it for free.