Why are lipoproteins needed to transport lipids in the bloodstream? g?

Lipoproteins form water-soluble complexes for transport through the bloodstream by combining water-insoluble lipids with polar phospholipids and proteins.

Lipids are hydrophobic, therefore they are water-insoluble and they cannot be transferred in water solutions, such as blood. Lipoproteins are assemblies that create a hydrophilic compound which permits the lipids to flow in the bloodstream.