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This study has shown that the addition of foodstuffs to the staples baked potato, pasta and toast had a consistent lowering effect on the GI value of that meal. These findings emphasise the importance of investigating the GI of composite meals.

The glycaemic response to eight potato varieties commercially available in Great Britain was compared against a glucose standard in a non-blind, randomised, repeated measure, crossover design trial. Seventeen healthy subjects (three males, fouteen females), mean age 32 (SD 13) years and mean BMI 22·3 (SD 3·6) kg/m 2 , were recruited to the study. Subjects were served portions of eight potato varieties and a standard food (glucose), on separate occasions, each containing 50 g carbohydrate. Capillary blood glucose was measured from finger-prick samples in fasted subjects (0 min) and at 15, 30, 45, 60, 90 and 120 min after the consumption of each test food. For each potato variety, the glycaemic index (GI) value was calculated geometrically by expressing the incremental area under the blood glucose curve (IAUC) as a percentage of each subject's average IAUC for the standard food. The eight potato varieties exhibited a wide range in GI values from 56 to 94. A trend was seen whereby potatoes with waxy textures produced medium GI values, whilst floury potatoes had high GI values. Considering the widespread consumption of potatoes in Great Britain (933-1086 g per person per week), this information could be used to help lower the overall GI and glycaemic load of the diets of the British population.Glycaemic index: Potato variety: Great Britain: Glycaemic load

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S U M M A R YA quantitative histochemical technique based on scanning microdensitometry has been used to investigate neutral lipid utilisation by hatched and dormant juveniles of Globodera rostochiensis and Globodera pallida.During storage in water at 20 "C, hatched juveniles of the two species showed no statistical difference in their rate of lipid utilisation. A semi-logarithmic curve fitted to the pooled data suggests that 50% relative utilisation occurred after 36 _+ 4 days of storage. Measurement of the neutral lipid reserves for unhatched juveniles of G. pallida dormant in field soils in Northern England for a maximum of 14 yr showed a reduced rate of metabolism with a 50% loss of neutral lipid reserves after 7-5 i 1.1