Some places in Peru are at very high altitudes and some of them are the highest
in the world (navigable lake, railroad, populated areas). Many tourist places
are high (Arequipa, Titicaca, Cusco, etc.) and it is necessary to take a few
precautions (see also recommendations
about health and comfort). In brief, mountain sickness (soroche)
can touch anybody, no matter the physical condition or age. The first half-day
in altitude (3000 metres and more), eat light and sweet, rest from time to
time, particularly during digestion. Do not smoke too much if you are smoker.
Drink infusions of sheets of coca (Coca tea) well sweetened and possibly take
a preventive treatment containing coca (Coca 9CH for example).
The Coca tea is an infusion available everywhere, even in supermarkets,
sold in teabags (as the tea you know). Every restaurant and bar proposes it;
even hotels offer it for free and unlimited. It is without side effects and
it often works. Drink it several times a day, especially first days.
In fact, it is impossible to know in advance the effects on an individual.
A great sportsman in full shape might not tolerate altitude, an older person
older in no shape maybe will…