Lemons contain bioflavonoids, nutrients that protect your body from environmental pollutants. I love this analogy - Along the membrane of each cell there are microscopic parking spaces called receptor sites. Pollutants, toxins and germs can park here and gradually eat ther way into the membrane of the cell, but when bioflavanoids fill up these parking spots, there is no room for toxins to park.
Bioflavanoids also reduce cholesterol's ability to form plaques in arteries and lessen the formation of blood clots which can lead to heart atacks and strokes.
Lemon also restores the acid-alkali balance in your body. Drinking freshly squeezed lemon juice in water first thing in the morning helps maintain your body's internal balance at a pH that supports healthy bacteria, instead of the viruses and harmful bactiera that thrive in more acidic environments.
If you can't handle drinking the juice of a whole lemon at once, have half in the morning, and half throughout the day in your bottle of water!