Bananas are mostly starch (C6H10O5) and sucrose (C12H22O11). The fats contain glycerol (C3H5OH3), and the other components contain potassium nitrogen, iron, zinc, chlorine, and trace quantities of a few other elements.
The core tempreature is sufficent to generate nucleosynthesis. This leads to the Carbon Nitrogen Oxygen chain, which increases fusion of helium and raises the temperature. If it gets hot enough, the model has to account for carbon fusion. I suspect that Dr Hawking, et al., have never contemplated this eventuality.
If one considers the solar system as a unit, do the planets represent accretion points of materials blown out from previous stars, which occurred far enough from the mass center that they avoided being included in the lighting of the central furnace? Did the heavier elements originate from hydrogen/helium furnaces finally blowing out of their fuel supply ... losing enough mass such that the gravitational compression no longer kept the fuels in proximity?
Why did the universe as a unit 'explode' into a limited volume which allowed for accretions? ... All of these simple questions, when arranged alonside the reality that the very small (atomic scale and quark scale) behaves very differently from the large, molecule size. In fact, few realize that the atomic scale behaves very differently from the quark scale.