I do not think it is possible. You can loose weight by not consuming anything (not receiving proper nutrition) and it can be damaging to the body. Also without the proper nutrients is would be hard to maintain fitness because you would lack energy.
Yes I do think you could but it would be extra hard because without proper nutrition your body doesn't get the right amount of protein and other things like that...
To avoid sun damage: Stay indoors between 10 a.m. and 2 p.m., when the sun’s burning rays are the strongest. Protect your skin with clothing, a hat, and sunscreen
