I'm surprised nobody's mentioned Rapeseed oil.
According to many medical authorities including this one Is rapeseed oil healthy? - BHF it's quite healthy.
Quote "
"It is low in saturated fat, the fat that can raise cholesterol levels.
In fact, it has the lowest amount of saturated fat of any oil. It has just half the amount found in olive oil."
I've been using it for cooking for several years and I find it quite agreeable, and, interestingly when I come to wash the pan, it washes off far more easily than other oils. This tells me it's "lighter"
I will use olive oil on salads, but generally just enough to thin out the light mayonnaise (which of course also contains oil)