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  • Title: Fat content of chips, quality of frying fat and deep-frying practices in New Zealand fast food outlets.
    Author: Morley-John J, Swinburn BA, Metcalf PA, Raza F.
    Journal: Aust N Z J Public Health; 2002 Apr; 26(2):101-6. PubMed ID: 12054325.
    Abstract:
    OBJECTIVES: To collect baseline data on the fat content of hot chips, quality (degradation) of cooking fat, deep-frying practices and related attitudes in fast food outlets in New Zealand. To identify the key determinants of the fat content of chips and quality of cooking fat. METHODS: A nationally representative sample of fast food outlets (n=150, response rate 80%) was surveyed between September 1998 and March 1999. Data collected included a questionnaire, observation of cooking practices and analysis of cooked chips and frying fat. RESULTS: Only 8% of independent operators had formal training in deep frying practices compared with 93% of chain operators. There was a wide range of fat content of chips (5%-20%, mean 11.5%). The use of thinner chips, crinkle cut chips and lower fryer fat temperature were associated with higher chip fat content. Eighty-nine per cent of chain outlets used 6-10 mm chips compared with 83% of independent outlets that used chips > or = 12 mm. A wide range of frying temperatures was recorded (136-233 degrees C) with 58% of outlets frying outside the reference range (175-190 degrees C). As indices of fat degradation, fat acid and polar compound values above the recommended levels occurred in 54% and 5% of outlets respectively. Operators seemed willing to learn more about best practice techniques, with lack of knowledge being the main barrier to change. CONCLUSIONS AND IMPLICATIONS: Deep frying practices could be improved through operator training and certification options. Even a small decrease in the mean fat content of chips would reduce the obesogenic impact of this popular food.
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