You can either squeeze the juice from pink grapefruit or buy a bottle of diluted pink grapefruit juice (no added sugar) and add it to a large glass of water. You can buy this at Tesco if in the UK or Ireland.Do not eat anything that is not mentioned in the above meal plan.Eat only what is shown above or do withoutNo substitutions allowedNo eating between mealsNo alcoholDrinks Allowed: black tea, black coffee, lemon tea, grapefruit juice squeezed from the actual fruit (you cannot drink it throughout the day, but only as it states on the above menu), tonic, soda or water only throughout the day.Salad: lettuce, cucumber, tomatoes, and celery onlyDO NOT DIET FOR MORE THAN ONE WEEK AT A TIME. The diet is only meant for one week at a time, so do it for one week then have 2 weeks off.I recommend the Chemical Diet to anyone that can eat the above food plan for just a week. It's easy if you are determined enough to stick to it and it's a bonus when you start to see the weight fall off. It can, also, start you off on a healthy weight loss journey if you use the food plan continuously, but add more vegetables, salad, fruit, cottage cheese, and low-fat yogurt to it after the first week. I have done this myself and it does work. You keep on doing the Chemical Diet every third week.Of course, I am not saying it is going to be easy, but after a week on the Chemical Diet, you can be certain that you will have at least lost one stone.Lately, I have been doing The Chemical Diet every month and it really does the trick and helps you lose a lot of weight quickly. I have managed to keep the weight off too. It's easy once you are in the right frame of mind and you have stuck to the diet for a while.