The FlexShares Morningstar Global Upstream Natural Resources Index Fund (GUNR) may be an ideal fit for investors seeking the portfolio and income diversification potential of an expanded definition of real assets. Some natural resources strategies can lead to over-concentration in industries such as energy and metals, but GUNR offers enhanced exposure to three sectors that may be overlooked: agriculture, timber, and water. An allocation to real assets can play an important role in a portfolio by providing income, inflation protection, and diversification from equities and bonds.