SUGAR
March raw sugar was down 0.24 cent, or 1.7 percent, at 14.17 cents per lb by 1417 GMT.
Dealers noted speculative selling had re-emerged after a recovery in prices on Friday, although volumes were modest and levels remained within recent range.
Plentiful global supplies and the threat of producer selling was dampening sentiment, as Brazilian mills were still seen as under-hedged.
"They've (the Brazilians) still got plenty to do," said one dealer. "They've done very little since June because the market has not had any sustained rally. But there will be a period where they will be forced to it."
The Brazilian real also reversed last week's gains on Monday, which boosts local currency returns on dollar-denominated commodities and encourages producer selling.
December white sugar was down $6.20, or 1.7 percent, at $368.60 a tonne, weighed by expectations of a surge in supply from the European Union.
"Whites seem to be finding some more selling after about a week of strength," the dealer said.
COCOA
December New York cocoa was down $27, or 1.3 percent, at $2,060 a tonne.
Prices hit a six-month high last week as speculators covered short positions, partly inspired by stronger-than-expected European cocoa grind data.
But dealers said on Monday the buying had fizzled out, leaving the market with few buyers.
I think the industry feels comfortable, I don't see them exactly stepping up to the plate in a hurry to extend their cover," said one dealer.
December London cocoa was down 17 pounds, or 1.1 percent, at 1,549 pounds a tonne.
Port arrivals in top grower Ivory Coast reached around 67,000 tonnes by Oct. 15 since the start of the season on Oct. 1, down from 98,000 tonnes in the same period of the previous season.
Dealers were awaiting third-quarter cocoa grind data from North America and Asia this week for further evidence of trends in demand.
COFFEE
December arabica coffee fell 2 cent, or 1.6 percent, to $1.2445 per lb, after hitting $1.2420, its weakest since June 30.
Prices have been pressured by persistent fund selling and expectations recent crop-friendly rains will boost output in top producer Brazil.
November robusta coffee slipped $25, or 1.2 percent, to $1,984 per tonne.