You're stupid. How the hell would you know anything about being fat long ago? For a fact, when humans don't eat, their bodies make an attempt to store as much fat as they can, and only use the fat to sustain at the verge of starvation. In healthy bodies, there's not much fat to use when there's no other food.
Long ago, people weren't fat because their daily lives required near constant physical strain, and they ate about half of what we eat by standard. They had to walk anywhere if they didn't have a wagon, and nearly everything was done by hand. I assume you're talking about times before industrialism, electricity, cars, etc...
Yeah, we might not have became as fat, but fat was still the best energy source because of it's high calorie density. Of course it probably was supplemented by a lot of sugary berries, but sugar has the advantage of quick and easy to metabolize energy.
We don't evolve like the taste of butter, you forgettard. "liking the taste" or something varies from person to person, and I know we have always accepted the taste of fat as something awesome, it's why people used to put butter on everything. Of course that was before they were eating so much food.
Like Fred said, we have evolved to like certain taste over others. If you did a taste test between a bitter sample against a surgery sample I'm sure 100% of people would like the sugar better. Bitter on it's own is considered a bad taste because it would have been associated with poison.
Yes of course taste varies from person to person a lot, but that's when your referring to combination of the basic tastes. When it comes down to basic taste on their own, people like certain ones better and they like foods that prominently have those good taste. That's why the sweets industry is so big, snack foods are salted for taste and fattier ice cream is labeled "premium".