The investment seeks high total investment return through a combination of high current income and capital appreciation. The fund will normally invest at least 80% of its net assets (plus any borrowings made for investment purposes) in fixed-income securities (for example, bonds and other investments that Loomis Sayles believes have similar economic characteristics, such as notes, debentures and loans). It invests primarily in investment-grade fixed-income securities worldwide, although the fund may invest up to 20% of its assets in below investment-grade fixed-income securities (commonly known as "junk bonds").