Because all "good" things are not good for all people!
Raw juices are very strong food and may be too much for some people.
Especially for people who have weak liver. When your liver is very weak, fresh juices may be too strong, and it may take too much of body's energy to digest those juices.
It usually means that you need more liver cleansing, and more good beneficial intestinal bacteria, and more good foods that contain good quality fats, like raw fish (smoked salmon, sushi with raw fish), raw eggs, raw meat (smoked and dried beef, smoked other meat), fermented milk products made of raw milk (sour cream, yoghurt,....)
You should consider visiting a good homeopath and going on some good homeopathic therapy (homeopathic sulfur,..)
Consider also miso soup!
Fish soups, meat, bones and vegetable soups are also foods that can help, and can give a sthrength.