You are definitely better of snacking on peanuts than, say, Doritos. It’s not that they are a bad food, they just don’t have a great macro balance if they are the major component of a diet. From this unvetted comparison they don’t seem to be too bad compared to other nuts.
If someone really wanted to get most of their calories from peanuts, they would probably want to supplement with something like pea protein powder and some high-fiber greens (or even beans). This would allow for keeping carbs relatively low while having a more even balance between fat and protein intake. Not quite keto, but not the typical high-carb western diet.
It depends on the type of fusion.
The easiest fusion reaction is deuterium/tritium - two isotopes of hydrogen. The vast majority of the energy of that reaction is released as neutrons, which are very difficult to contain and will irradiate the reactor’s containment vessel. The walls of the reactor will degrade, and will eventually need to be replaced and the originals treated as radioactive waste.
Lithium/deuterium fusion releases most of its energy in the form of alpha particles - making it much more practical to harness the energy for electrical generation - and releases something like 80% fewer high energy neutrons – much less radioactive waste. As a trade-off, the conditions required to sustain the reaction are even more extreme and difficult to maintain.
There are many many possible fusion reactions and multiple containment methods - some produce significant radioactive waste and some do not. In terms of energy output, the energy released per reaction event is much higher than in fission, but it is much harder to concentrate reaction events, so overall energy output is much lower until some significant advancement is made on the engineering challenges that have plagued fusion for 70+ years.