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    Investigating eating behaviours as predictors of body composition and dietary intake in New Zealand European, Māori and Pacific women - the women's EXPLORE study : a thesis presented in partial fulfilment of the requirements for the degree Master of Science in Nutrition and Dietetics, Massey University, Albany, New Zealand
    (Massey University, 2018) Shepherd, Katrina Jade
    Background/Aim: Internationally, eating behaviour has been linked with an optimal and adverse body composition in women. However no study to date has examined eating behaviour in female New Zealand ethnic groups. Therefore, the aim of this study was to investigate eating behaviours as predictors of different body composition factors and dietary intake in New Zealand European (NZE), Māori and Pacific women, aged 16-45 years, participating in the women’s EXPLORE study. Methods: Women (N=368) were assessed for basic anthropometry, total adiposity, regional adipose distribution and lean mass using height, weight, circumferences, dual x-ray absorptiometry and air-displacement plethysmography. Body composition profiles (normal-fat, hidden-fat and apparent-fat) were established using parameters of body mass indices and body fat percentages. The validated Three-Factor Eating Questionnaire (TFEQ) and New Zealand Women’s Food Frequency Questionnaire were both used to examine eating behaviour and dietary intake, respectively. The TFEQ examined Restraint (Flexible and Rigid), Disinhibition (Habitual, Emotional and Situational) and Hunger (Internal and External). Combinations of behaviour (sub-groups) were established from the main categories and also examined. Results: Restraint was significantly higher in NZE than Pacific women (p = 0.015). Disinhibition was significantly higher in the apparent-fat profile than normal-fat profile (p < 0.001). Likewise, Hunger was significantly higher in Pacific (p < 0.001) and the apparent-fat profile (p = 0.034) than NZE women and women with normal-fat profile, respectively. Adverse tendencies of Habitual Disinhibition, and External Hunger were more prominent in Pacific and the apparent-fat profile than NZE women and normal-fat profile, respectively (all p < 0.05). External Hunger was more prominent in the hidden-fat profile than normal-fat profile (p = 0.001). When accounting for age and ethnicity the most significant predictors of BMI and BF % were Restraint (p = 0.007 and p = 0.005 respectively), Disinhibition (both p < 0.001), Habitual Disinhibition (both p < 0.001) and Emotional Disinhibition (both p < 0.001). Non-ideal behaviour combinations (Low Restraint High Disinhibition and High Hunger High Disinhibition) generally corresponded to significantly higher body composition markers and dietary intake (p < 0.05). Pacific women were three times more likely to have High Hunger High Disinhibition than NZE women (p = 0.004). Low Restraint High Disinhibition and High Hunger High Disinhibition increased by 12% and 11%, respectively from the normal-fat profile to hidden-fat profile (both p < 0.001). Conclusions: The TFEQ eating behaviour categories, sub-categories and sub-groups can significantly vary between ethnicities and body composition groups. Tailored interventions to promote Restraint (particularly Flexible Restraint) and counteract Disinhibition (particularly Habitual Disinhibition and Emotional Disinhibition), Hunger (particularly External Hunger), Low Restraint High Disinhibition and High Hunger High Disinhibition could enhance eating behaviour and dietary intake and help optimise weight management in young New Zealand women.
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    Breakfast intake, habits and body composition in New Zealand European women : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Nutrition and Dietetics, Massey University, Albany, New Zealand
    (Massey University, 2017) Cullen, Elizabeth Margaret
    Background: The rise of obesity and related poor health outcomes is rampant in New Zealand. Dietary factors are key in the aetiology of obesity. One dietary factor with wide reaching implications on health and weight maintenance is breakfast consumption. Breakfast consumption has declined in New Zealand in recent years, and adverse health outcomes have risen concurrently. Breakfast consumption has been associated with lower BMI, improved appetite control, better diet quality, and more stable glycaemia. Objective: The aim of this study was to describe and compare reported and observed breakfast consumption between obese and normal weight New Zealand European women aged 18-45 years, living in Auckland, New Zealand. Methods: In a cross-sectional study, healthy women (n=75 normal BMI, n=82 obese BMI) completed a 5-day food record, an observed ad libitum buffet breakfast assessment and body composition measurements. Nutrient intake, food choices and behavioural aspects, including pace of eating and meal skipping data were obtained and analysed. Results: More normal BMI women (n=69; 84.1%) than obese BMI women (n=56; 74.6%) consumed breakfast daily. Obese BMI women consumed significantly more energy at the observed breakfast (1915 ± 868 kJ) than at the recorded breakfast (1431 ± 690kJ, p<0.001); however neither BMI group met one third of estimated energy requirements at either breakfast occasion. Carbohydrate consumption was lower than recommended (AMDR: 45-65%) in both groups in the recorded breakfast (40.7% and 42.6%; normal BMI and obese BMI respectively), whereas total fat consumption was higher than recommended (AMDR: 20-35%) (36.5% and 35.9% respectively). Protein consumption was within AMDR recommendations (15-25%) for both groups in the recorded breakfast (16.3% and 17.5%) but not in the observed breakfast, (13.0% and 14.0%), obese BMI and normal BMI respectively. Foods with the greatest contribution to energy at the observed breakfast for obese BMI women were discretionary items (fats, cake and biscuits), compared with sweetened cereals, nuts and seeds for normal BMI women. Having a faster pace of eating and consuming foods with a higher energy density significantly increased the likelihood of falling into the obese BMI category (b=3.11, p=0.016; b=1.35, p=0.042 respectively). Conclusions: Consuming a breakfast, particularly one that contains whole grains, fruits and low-fat dairy products, and minimising discretionary items could enable women to more closely meet dietary recommendations, and as a result, improve health outcomes. Key words: breakfast, obesity, energy intake, appetite, pace of eating
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    Whey protein and satiety in humans : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Nutritional Sciences at Massey University, Manawatu campus, Palmerston North, New Zealand
    (Massey University, 2013) Chung Chun Lam, Sylvia Mee Siong
    Protein is the most satiating macronutrient and there is an effect of dietary protein source, with dairy whey protein being particularly effective in promoting satiety in adult humans. The underlying cause for this remains to be elucidated. The objectives were to confirm that whey protein is more satiating than maltodextrin carbohydrate in adult humans, to understand the potential mediating factors and to investigate which characteristic of whey protein gives rise to its satiating effect. Ad libitum food intake at a subsequent test meal after administration of a preload, subjective feelings of appetite (using visual analogue scales) and plasma concentrations of satiety-related hormones and metabolites were determined. Preload diets enriched with whey protein induced a greater reduction in subsequent food intake and suppression in rated feelings of appetite compared with maltodextrin carbohydrate (p<0.05). The time of consumption of the whey protein preload did not influence the satiety response. Plasma concentrations of pancreatic polypeptide hormone, total amino acids, and the branched-chain amino acids appear to play an important role in mediating the satiating effect of whey protein (sustained increases from 15 to 120 min following preload consumption, p<0.05). To determine the underlying characteristic of whey protein causing the satiating effect, the effects on satiety of whey protein components (glycomacropeptide, alpha-lactalbumin, or beta-lactoglobulin) and a free amino acid mixture simulating the amino acid composition of the whey protein were compared with that of the intact whey protein. The amino acid composition of whey protein per se appears to be important in the regulation of food intake and the induction of satiety. The individual constituent proteins or whey protein itself did not promote higher satiety than that found based on providing the free amino acids. The absorbed amino acid profile would appear to play an important role in mediating the satiating effect of whey protein.