One must be especially careful about what they eat or drink while travelling in this part of the world.  The food or drink may be cause to the health problems like diarrhea they face in Tibet, which can be easily contracted with even after serious precaution taken.  However, some careful practices may help to avoid the sickness or alleviate the bad effect after one has contacted it.  Iodine solution or tablets are very good to purify drinking water as normal measures may not be strong enough to kill giardia a common cause to diarrhea.  Non-chemical filters may not be adequate to disinfect from viruses such as hepatitis.  So they may not be used alone for the purpose.  Boiled tea or water is mostly safe.  Contaminated tap water used to brush teeth is also a source of Diarrhea so it is advisable to use only purified water for the purpose.

The quality of food can vary greatly from place to place.  Like the accommodation the food are not very attractive in most of the places in Tibet.  Even the picnic box lunches on the day excursions can also be sub-standard.  It also is not uncommon for tourists, whose appetites are diminished by touch of altitude sickness, or who prefer to rest in their rooms to forego an occasional meal.  This is when it is advisable for you to maintain a supply of some snaks such as Granola or museli, trail mix, a can of tuna, peanut butter, candy bars are all high-energy snack food that pack well and will go a long way. But during camping arrangements in Tibet for trekking and tours from Kathmandu supported by Sherpas, one need not to worry about the quality of food they are served.  Hot and recently cooked food are best.  Foods that are peeled or skinned are also usually safe to eat. Especially when visitors are not sure under what conditions the food has been prepared, they should avoid cold salads or other not recently cooked food that may have been sitting out for a long period of time. Salads cleaned & soaked in iodine are also

Good restaurants are not available on the highways in Tibet. Therefore, we recommend clients to carry lunch boxes. However, realizing that lunch stops during the tour can be a bit unappetizing, bringing own snacks would be a great idea. They should bring foods they like & can eat easily (i.e. crackers, cheese, cookies, chocolate bars, granola bars, soup mix or peanut butter). But it is advisable not to bring too much. Ascending to high altitude many people find their appetites greatly diminished. This is a mild symptom of altitude sickness, so they should not be surprised if they are not very hungry. Also, unlike trekking, they will not have a lot of exercise as they will sit in the bus and watch the passing scenery most of the time.