Long distance walkers, world travelers, and explorers look upon the lemon as a Godsend. When fatigue sets in, they might suck lemon juice by piercing the top of the fruit with a straw, giving themselves a quick-acting medicine and a lovely refreshment.
Explorers also use lemon for protection against many infections of the tropics. A small amount of lemon juice will quench thirst more effectively than many times the amount of water. Experienced travelers declare that when they add lemon juice to ordinary drinking water, in various localities, it acts as an antiseptic and prevents illness due to allergy to different water supplies.
Lemon oil also seems to be able to stimulate brain activity so whenever you feel tired for no reason or are finding it hard to focus or concentrate, add 4 drops of lemon oil to a water-filled aromatherapy lamp. Alternatively, drink a glass of lemon water every few hours.