This is my theory for reducing mass in an object/subject. I hope you find this at least entertaining. Reducing mass involves displacement of it trading or storing the mass you want to change, this is the way the atoms must be changed, it involves space, time, and placed energy at a volume and speed. Like the possibilities of time travel or teleportation a fixed point of both objects or space the object or objects occupy must be calculated as well as both objects’ mass and degree of it you desire to change which takes a lot of energy to achieve like possibly solar, nuclear power or cold fusion of a high magnitude. In short you are teleporting the mass of an object to another space or another object, the act of splitting and displacing atoms. The most important factor is the rate of temperature of applied energy too much or too little can damage the object or subject causing non-viability for it to possibly implode, explode, or disintegrate. Like I mentioned earlier a spatial displacement field must be achieved to alter an object or subject, this is the main theory of changing/altering matter by calculating and then altering the space it occupies. For a living subject’s properties must be altered by strength or acceptance to keep them alive, factors like breathing thicker air/strengthening the subject’s lungs, ingesting/consuming denser water and food/strengthening the subject’s digestive system, and also strengthening their skin and bones to make it more durable for the larger environment, giving them a mouse or rat’s or even an insect’s viability. One final important factor to have is the stability of the subjects’ new state of existence, staying intact over time, applying constant viability to its new size. In physics or the physical world all requirements must be met to make anything possible, yes today’s science fiction is tomorrow’s science fact, once all factors are met to make the impossible, possible.