The most interesting thing I discover in my daily work is how little what we do physically affects how we look.
Our health is an intricate combination of not only our physical body but also our biochemistry (how our body chemicals work in the body); our emotions and also our energetic signature (our chi, prana, our "attractor field"). Each part forms part of what is called the "triad of health". Each part of the triad can both positively and negatively affect all the other parts.
For example, when we have an emotional issue in our lives which stress us in any way this can affect all other areas of our health. This includes how we stand (our posture changes significantly depending on how we feel about ourselves); how we speak, how we think and feel and therefore our overall energetic signature.
Our energetic signature or vibration is also our attractor field. How we vibrate determines what we then attract to ourselves.
For example, if our vibration was in fear, our heads often drop, our shoulders sit forward and our diaphragm (the muscle at the bottom of our ribcage that moves when we breathe) tends to get squashed. When this happens, we get less oxygen to our body and our body becomes more acidic. When we become more acidic we then start craving more sugar, caffeine and other addictive substances. As we continue to become more acidic we tend to have develop fungus and parasites in our body which further drop our immune system. When our immune system is dropped and our body is acidic we can also suffer from cloudy thinking, tiredness, itchy and dry skin, and anxiety and depression. In this state we are more likely to make bad choices for our body including eating foods that don't serve us at times that our body doesn't like (A McDonalds run at 11pm is a prime example of this!). When all of this compounds we then tend to gain weight, or stop eating altogether just to survive.
The trick to changing all of this is to stop that negative spiral by working on the EMOTIONAL CAUSE. Whether you are in fear because of a change in relationship, work situation or a family member causing you stress, your weight gain or reduced health your body will react accordingly and your health will deteriorate.
So if you are eating "all the right things" and doing "all the right exercise" but still can't get to their ideal weight perhaps you will think twice before beating yourself up about the extra piece of cake you ate and start looking at the rest of your life to see what may have been the trigger.
Often by coming to terms with and dealing with your emotional stress it can be all your body needs to actually reach your ideal weight.