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Fig. 11.1 Energy imbalance and obesity. * BMR = basic metabolic rate. Question: From where do the 500 calories (excess to total energy requirements) which cause weight gain come? The chocolate? The wine? The cheese? The crisps? The icecream?

Answer: They do not come from any one source they come from all the food consumed. It is the total number of calories consume that is important.

Fig. 11.1 Energy imbalance and obesity. * BMR = basic metabolic rate. Question: From where do the 500 calories (excess to total energy requirements) which cause weight gain come? The chocolate? The wine? The cheese? The crisps? The icecream?

Answer: They do not come from any one source they come from all the food consumed. It is the total number of calories consume that is important.

obese subjects, is hampered by under-reporting (25, 26). It has been suggested by Summerbell etal. (27) and supported by the recent work of Poppitt et al. (28) that omission of snacks from diet records may accentuate the fat content of diets, since snacks tend to be higher in sugars than fats when compared with main meals, and be responsible for the apparent higher proportion of energy from fat in obese subjects. This is unlikely to account for all of the association for, biochemically, dietary fat is used more efficiently and may predispose to the laying down of adipose tissue (29). However, contradictory data have been reported in lean subjects (30).

In determining the association between obesity and fat intake, the role of fat preference is crucial. Laboratory studies of fat preferences in obese consumers reveal a close relationship between taste preferences for fat and body fat (16,

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