Demand is real and rich — that was never the question
Most market-entry reports open by asking whether the appetite exists. In Sweden it plainly does: a wealthy population — $57.1k per head — that has folded protein into everyday grocery habits, with steady, durable interest in protein as a nutrient. The catch is size: at 10.57 million people, this is a rich niche, not a big market. The question isn't whether Swedes will buy protein drinks — it's whether there's any room left to sell them one. A small, affluent, health-literate population is the ideal customer and the ideal trap: lucrative per head, but quick to fill and hard to grow.
Affluence and appetite are settled; the constraint is a small market that's already served.
So, for an entrant → Underwrite the competition and the margin, not the demand.