"The body only makes cholesterol in relationship to its acid load." Robert O Young
Acid is found in foods we eat day to day. When you consume sweets, refined carbohydrates, meat, carbonated sweetened beverages, yeasty foods, moldy foods (found in various cheeses), bacteria type foods (like yogurts) your body has to work hard to alkalize those foods. It does this by taking alkalizing minerals like calcium from your bones, magnesium, potassium, sodium from your body. It is a process of harmony.
Our body also become acidic by our thoughts and actions. Angry, upset, worried, negativity all produces acidic reactions in your body. Peace, calmness, energy, happy disposition comes from alkaline balance.
Opposites are necessary, but balance is more important to your health!