Vegitables are freely available on this diet, as on many other diets. Fruit is not. This is because the main causes of weight gain are eating too much carbohydrate and sugars, simple overeating, and eating manufactured foods with concealed ingredients and chemicals. Sugar itself isn’t the worst kind of sugar, fructose (fruit sugar) is more fattening than sugar, fruit juice is worse, sweetened fruit juce is worse still, and corn syrup, dextro type compounds added by manufactureres are worse still. So absolutely no 5 a day.
You must eat some vegitables, including some root vegitables especially carrots, but also suede, parsnip etc., you must include some leafy green vegitables such as lettuce, purple sprouting brocoli, spinach, but also leeks, peas, radish, runner beans, broad beans, whatever is in season. Rhubarb is classed as a vegitable. Potatoes are an excellent form of carbohydrate, You can have jacket potatos, mashed, roast, chips, if you have the fat left from your allowance. Duck fat makes excellent roast potatoes. You can make gravy of course, using dripping for example. You must eat somwhere near you allowace of meat, and fat.
You can substitute off ration protein foods for the bacon, ham, and sausages, such as rabbit, shell-fish etc. Some of your fat can be in the form of oil such as vergin olive oil, but remember, oils are best not heated, for frying you should use animal fat, its less likely to to form free radicals, which carry a cancer risk. You must eat something containing calcium such as cheese or milk, or lots of leafy greens. You must get some sunlight on you each day, but only for very short periods in the middle of the day in the middle of the year. You must eat some oily fish each week.