Biological Scientist Training and Qualifications. Most biological scientists need a Ph.D. in biology or one of its subfields to work in independent research or development positions. Other positions are available to those with a master's or bachelor's degree in the field.Education and training.A Ph.D. is usually necessary for independent research, particularly in academia, as well as for advancement to administrative positions.ther positions are available to those with a master's or bachelor's degree in the field. Education and training. A Ph.D. is usually necessary for independent research, particularly in academia, as well as for advancement to administrative positions.
Not all illnesses are physical. According to American Family Physician, depression is a major cause of weight loss among elderly people, and when Alzheimer's disease is accompanied by weight loss of 5 percent or more, it's generally a precursor to death. Personality disorders such as anorexia and bulimia rob pounds, especially in young people.
One cause is the cancer itself. For example, in an effort to fight the cancer, the body produces substances called cytokines. These substances can lead to weight loss, muscle loss, and a decrease in appetite.