The traveler is cut off from those objects to which he is accustomed in his family; he is attacked by fatigue and malaise; he has to take care of his treatment so that various diseases do not befall him. Most of all, he should take care of his nutrition and eliminating fatigue. It is necessary to improve your food, eat food with good substances in small quantities, so that it is digested well and excess does not accumulate in the vessels. You should not set off on a journey with a full stomach, so that the food does not spoil and the need to drink water does not appear, because as a result of this, churning increases, vomiting occurs and the need to recover. Therefore, eating should be postponed until a break, unless there are other reasons, which we will talk about later.
If you cannot do without, then you need to have a light snack for relief, so that there is no need to drink water; the journey is still made at night or during the day.
You need to take measures against fatigue according to what we said in the chapter on types of fatigue.
You should not travel when the body is congested with blood or other juices. First you need to cleanse the body and then go on a journey.
If a traveler suffers from indigestion, then you need to get hungry, get enough sleep, eliminate the indigestion, and then hit the road.
A must for a traveler is a gradual increase in light physical exercise compared to regular exercise.
If the need arises to stay awake, which he must submit to on the way, then he needs to get used to insomnia gradually.
If you expect to have to go hungry or thirsty and the like, then you need to get used to it. You should also get used to the food you are supposed to eat while traveling. Food should be small in volume, but high in nutritional value; Vegetables and fruits and, in general, everything that forms raw juice should be avoided, except in cases where they are needed for medicinal purposes, which we will define later.
For the most part, the traveler is forced to learn to patiently fast, which will reduce his appetite. Among the remedies that help in this case are foods made from fried liver and the like. Often kebabs are made from the liver along with sticky things with various kinds of rendered nutritious internal lard, almonds, almond oil; use internal lard, for example, beef. If you eat one serving, you can endure hunger for a considerable time.
They say that if someone drinks one ritl of violet oil, melting a little wax in it so that it becomes like kiruti, he will not want to eat for ten days.
There is also often a need to learn to tolerate thirst. The traveler must take with him thirst-quenching drugs, which we explained in Book Three, in the chapter on thirst. In particular, you should drink a potion of three dirhams of purslane seeds with vinegar.
You need to avoid foods that make you thirsty, such as fish, capers, pickles and sweets, and you also need to talk less and move carefully.
If in areas where there is little water, you drink it with vinegar, then a small amount of this mixture will be sufficient to quench your thirst. Drinking the mucus of plantain seeds has the same effect.