Recently my IBS C has started to get worse and worse, so I've just embarked on the FODMAP diet as recommended by a friend, who is a doctor. Not really sure where to start, I bought the book 'IBS - Free at Last' by Patsy Catsos as it had good reviews on Amazon. So, I went out shopping this weekend and bought all the 'allowed foods' in the book, only to find that the book is out of date and a lot of foods that she deems 'allowed' have now been ruled out. If anyone wants a massive bag of mushrooms and a cauliflower I have plenty going spare....The book is American and all food portions/recipes are measured out in cups, which is confusing to me. Trying to find a standard conversion table on the net has proved very difficult; in the past I've always gone on the knowledge that one cup is equivalent to 8 fluid ounces, but found many websites said that the measurement in ounces differs depending on the type of ingredient, e.g; whether you're measuring dry goods, or fruit, or liquid etc. So, I've just sort of been guessing.Anyway, I've been doing the diet for 4 days now, and I'm not expecting to see an improvement just yet. But, I'm really struggling with the portion sizes. I am a very big eater, plus I run on a regular basis so I'm constantly hungry, and four days into this diet I'm STARVING! The book I'm following sets a meal-plan to help you get the gist of the diet for the first two weeks, but some of the meals and snacks are leaving me with a rumble in my tummy! For example, a suggestion for a mid-morning snack is some cherry tomatoes and a low-fat mozzarella stick - I would usually eat a flapjack, a banana/raisins and 4 cheesy oatcakes!! She pads out a lot of the meals and snacks with nuts, and I'm terribly allergic to nuts so this is a no-go for me, but I'm not sure what I can replace this food group with without eating too many danger foods in one meal.Today, I've already eaten:Breakfast:1 cup cheerios, handful of blueberries & lacto-free milk1 rice cake with a little bit of butterMid-morning snack:2 rice cakes1 gherkin5 cherry tomatoes1/2 oz brieA small bit of ham1 celery stick1 boiled eggLunch:Baked potato with tuna, cucumber and mayoNot even sure if I should be eating this much, but my usual diet consists of lots of oats, dried fruit and pulses which I've had to eliminate. I don't find that raw fruit and veg fills me up as a snack so I'm having to eat loads of it for it to even touch the sides!Would be interested to know how other people have coped on this diet. Being a very thin person, I've never had to go on a diet before of any kind, so this is a real test of my willpower.