That definition expands to cover the confusion offered to nature by scientists and their ever-pressing mission to somehow improve lifeforms via GMO (Genetically Modified Organism) processes. To listen to them, they will not be satisfied until they can modify life to the point it can be born, grow, and not age on a diet of nothing at all. Think "sunset technology" here and rest assured that nature will effortlessly continue to squash their lofty plans.
Most, if not all, authors quoted in the Reams Biological Theory of Ionization literature are uniformly unimpressed with GMO. They stand united in viewing lifeforms coming down the biological ages as fully perfect in every sense. They have unwavering trust that when those biologically perfect lifeforms are conceived and allowed to grow with the full spectrum of minerals needed for their respective kind, or order, they will progress through their lives unaffected by germ, parasite, or disease.
The RBTI community views all disease as a mineral deficiency. Their response when shown a gene sequence which claims to identify a "disease" is that if the appropriate minerals had been available at the time of the gene creation, a higher order of genetic expression would have developed.
Although there are several diseases, plant or animal, such as wheat rust or muscular dystrophy, that strongly resist mid-life reversal, almost all life forms will find health if their required building materials are present during seed, sperm, or egg development. Good parentage and good food (following a good birth) is to be devoutly desired and is absolutely our heritage.