SUGAR
March raw sugar was down 0.28 cents, or 2.3 percent, at 12.11 cents per lb by 1442 GMT. It had dropped as low as 12.08 cents, its weakest since early October.
Prices were pressured by a slide in Brazil's real currency, prompting speculative selling that was followed by chart-based selling when prices dropped below key support levels, dealers said.
A weaker real encourages producer selling because it improves local returns on dollar-traded commodities such as sugar and coffee.
Dealers also noted continuing uncertainty over fundamentals, partly owing to lack of clarity around the timing of exports from India and future output from the country.
Marex Spectron estimated India's exports in the current season would reach between 3 million and 3.5 million tonnes. The Indian government this year approved a sugar industry support package aimed at driving 5 million tonnes of exports.
"Despite the indirect export subsidy ... export sales have so far been modest," the broker said in a note, estimating export sales at about 1 million tonnes so far, mostly for first-quarter shipment.
March white sugar was down $5.70, or 1.7 percent, at $333.30 a tonne.
COCOA
March London cocoa was unchanged at 1,764 pounds a tonne after touching 1,766 pounds, its highest since July 18.
Trade was choppy in thin trade, however, and dealers said the technicals-led buying that provided support had quickly petered out.
Cocoa speculators cut their net short position in London cocoa by 9,072 lots to 5,465 lots as of Dec. 24, data showed on Friday.
March New York cocoa was up $21, or 0.9 percent, at $2,429 a tonne, supported by a softer US dollar.
COFFEE
March robusta coffee fell $14, or 0.9 percent, to$1,514 a tonne.
The focus remained on the threat of hedging by Vietnamese producers, who are near the end of a massive harvest this season.
March arabica coffee slipped 1 cent, or 1 percent, to 99.95 cents per lb, also weighed down by the Brazilian real.