FTSE edges lower; pharmas, food retailers support

* FTSE 100 down in early trade

* Defensive drugmakers, food retailers gain

* Energy firms, banks retreat

By Harpreet Bhal

LONDON, June 23 (Reuters) - Britain's top share index edged lower early on Tuesday, as worries over the health of the global economy prompted a return to risk aversion but losses were limited by strength in defensive food retailers and drugmakers.

By 0833 GMT, the FTSE 100 .FTSE was down 7.39 points at 4,226.96, after closing on Monday at its lowest since April 29. The index has fallen 3.9 percent so far in June, reversing three months of consecutive monthly gains since the all-time low reached in March.

Howard Wheeldon, strategist at BCG Partners in London, said the FTSE 100 is taking a breather, in tandem with equity moves around the globe.

"What we will see as this week moves on are more sideways moves. Sideways momentum and stagnation are showing themselves right now," he said.

U.S. stocks suffering their worst one-day loss in two months on Monday, while Asian stocks tumbled as investors took profits.

Oil and gas firms fell as oil stayed below $68 a barrel. Royal Dutch Shell (RDSa.L), BP (BP.L) and BG Group (BG.L) lost between 0.3 and 1.1 percent.

Drugmakers, perceived as safe-bet assets, rose with Shire (SHI.L), AstraZeneca (AZN.L) and GlaxoSmithKline (GSK.L) adding between 0.6 and 1.6 percent. Shire (SHI.L) rose 1.5 percent.

Anglo American (AAL.L) shed 0.7 percent after rejecting a proposed merger with Xstrata (XTA.L), which gained 1.3 percent.

Anglo American pared losses as traders cite market talk of a bid from Chinalco. Both Chinalco representatives in London and officials from Anglo American declined to comment.

Other miners Eurasian Natural Resources (ENRC.L), Rio Tinto (RIO.L), Kazakhmys (KAZ.L) added between 0.2 and 1.1 percent.

Supermarkets Sainsbury (SBRY.L) and Tesco (TSCO.L) gained 0.9 percent and 0.7 percent respectively.