In Moser, I. and Solomon, S. - How and When to Be Your Own Doctor, I found this>
"Weaning yourself back on to food should last just as long as the fast. Your first tentative meals should be dilute, raw juices. After several days of slowly building up to solid raw fruit, small amounts of raw vegetable foods should be added. If it has been a long fast, say over three weeks, this reintroduction should be done gingerly over a few weeks. If this stage is poorly managed or ignored you may become acutely ill, and for someone who started fasting while dangerously ill, loss of self control and impulsive eating could prove fatal. Even for those fasting to cure non-life-threatening illnesses it is pointless to go through the effort and discipline of a long fast without carefully establishing a correct diet after the fast ends, or the effort will have largely been wasted."
In Evarts Loomis - Therapeutic Fast>
"As a rule of thumb, approximately the same length of time should be given to the withdrawal phase as was spent on the fast. It should be remembered that at the end of the fast, the amount of digestive juices available is limited and the stomach may have considerably shrunk. Thus the initial feedings should be in small amounts at frequent intervals. Breaking this rule and gorging after a fast as some occasionally do, or eating highly refined or spiced foods, can have serious consequences, such as severe abdominal pain, diarrhea and vomiting. Deaths have even been reported from such impulsive behavior.
The longer the fast, the more care is needed in its method of termination. The usual procedure is to break it with fruit or vegetable juices. Meadowlark's routine is one glass of fruit juice for breakfast and two to three of vegetables juices during the remainder of the day. In the case of fasts that have continued longer than a week, the juices should at first be diluted. These are sipped at intervals throughout the day and not gulped down as a substitute for a meal.
From juices the next step is the introduction of a breakfast of fruits or Muesli, and the other two meals of vegetables, largely raw or very lightly cooked. If there is a suspected reaction to foods, this is the time for presumptive food testing as already described. Lastly we would add dairy products and wheat, carefully noting any possible change in pulse rate or other symptoms that might suggest a reaction to either.' "
In Elson M. Haas M.D.: Nutritional Program for Fasting>
"Breaking a fast must be planned and done slowly and carefully to prevent creating symptoms and sickness. It is suggested that we take several days, or half of our total cleansing time, to move back into our diet, which is hopefully a newly planned, more healthful diet. Our digestion has been at rest, so we need to go slowly and chew our foods very well. If we have fasted on water alone, we need to prepare our digestive tract with diluted juices, perhaps beginning with a few teaspoons of fresh orange juice in a glass of water and progressing to stronger mixtures throughout the day. Diluted grape or orange juice will stimulate the digestion. Arnold Ehret, a European fasting expert and proponent of the "mucusless" diet, suggests that fruits and fruit juices should not be used right after a meat eater’s first fast because they may coagulate intestinal mucus and cause problems.
However you make the transition, go slowly, chew well, and do not overeat or mix too many foods at a meal. Simple vegetable meals, salads, or soups can be used to start. Fruit should be eaten alone. Soaked prunes or figs are helpful. Well-cooked brown rice or millet is handled well by most people by the second day. From there, progress slowly through grains and vegetables. Some nuts, seeds, or legumes can be added, and then richer protein foods if these are desired. Coming back into foods is a crucial time for learning individual responses or reactions to them. You may even wish to keep notes, following such areas as energy level, intestinal function, sleep patterns, and food desires. If you respond poorly to a food, avoid it for a while, perhaps a week, and then eat it alone to see how it feels."