A bottle of water can put out a candle flame, but it won't put out a raging forest fire – it’s the right tool, but not nearly the right QUANTITY to get the job done. The same can be said for the amount of Chiropractic care you may need for your particular problem.
The purpose of frequent adjustments is to keep your nerve system clear long enough so your body can grow into a new, healthier state. For many (especially if you have long standing, chronic health issues) that means a higher quantity of sessions in the beginning to help your body overcome the ‘fire’ going on inside you. Note, adjustments don't do the healing... it's the time you remain subluxation free that does.
One day at the gym won’t turn you into Arnold Schwarzenegger and a single, low carb meal won't make you skinny. Exercise and proper nutrition can get you healthy, but they need to be repeated regularly to see real change. Likewise, desired Chiropractic results come from time, repetition and a sustained clear nerve system. Don’t expect one session to get the job done.