Influences on gum feeding in primates

This chapter reviews the factors that may affect patterns of gum feeding by primates. These are then examined for mixed-species troops of saddleback (S. fuscicollis) and mustached (S. mystax) tamarins. An important distinction is made between gums produced by tree trunks and branches as a result of damage and those produced by seed pods as part of a dispersal strategy as these may be expected to differ in their biochemistry. Feeding on fruit and Parkia seed pod exudates was more prevalent in the morning whereas other exudates were eaten in the afternoon. This itinerary may represent a deliberate strategy to retain trunk gums in the gut overnight, thus maximising the potential for microbial fermentation of their β-linked oligosaccharides. Both types of exudates were eaten more in the dry than the wet season. Consumption was linked to seasonal changes in resource availability and not the tamarins’ reproductive status pro-viding no support for the suggestion that gums are eaten as a pri-mary calcium source in the later stages of gestation and lactation. The role of availability in determining patterns of consumption is further supported by the finding that dietary overlap for the trunk gums eaten was greater between species within mixed-species troops within years than it was within species between years. These data and those for pygmy marmosets (Cebuella pygmaea) suggest that patterns of primate gummivory may reflect the interaction of prefer-ence and availability for both those able to stimulate gum production and those not

The Effect of Sugar-Free Versus Sugar-Sweetened Beverages on Satiety, Liking and Wanting: An 18 Month Randomized Double-Blind Trial in Children

BACKGROUND: Substituting sugar-free for sugar-sweetened beverages reduces weight gain. A possible explanation is that sugar-containing and sugar-free beverages cause the same degree of satiety. However, this has not been tested in long-term trials. METHODS: We randomized 203 children aged 7-11 years to receive 250 mL per day of an artificially sweetened sugar-free beverage or a similarly looking and tasting sugar-sweetened beverage. We measured satiety on a 5-point scale by questionnaire at 0, 6, 12 and 18 months. We calculated the change in satiety from before intake to 1 minute after intake and 15 minutes after intake. We then calculated the odds ratio that satiety increased by 1 point in the sugar-group versus the sugar-free group. We also investigated how much the children liked and wanted the beverages. RESULTS: 146 children or 72% completed the study. We found no statistically significant difference in satiety between the sugar-free and sugar-sweetened group; the adjusted odds ratio for a 1 point increase in satiety in the sugar group versus the sugar-free group was 0.77 at 1 minute (95% confidence interval, 0.46 to 1.29), and 1.44 at 15 minutes after intake (95% CI, 0.86 to 2.40). The sugar-group liked and wanted their beverage slightly more than the sugar-free group, adjusted odds ratio 1.63 (95% CI 1.05 to 2.54) and 1.65 (95% CI 1.07 to 2.55), respectively. CONCLUSIONS: Sugar-sweetened and sugar-free beverages produced similar satiety. Therefore when children are given sugar-free instead of sugar-containing drinks they might not make up the missing calories from other sources. This may explain our previous observation that children in the sugar-free group accumulated less body fat than those in the sugar group.<br /

Sweet taste pleasantness is modulated by morphine and naltrexone

Rodent models highlight the key role of µ-opioid receptor (MOR) signaling in palatable food consumption. In humans however, the effects of MOR stimulation on eating and food liking remain unclear. In a bidirectional psychopharmacological cross-over study, 49 healthy men underwent a sweet taste paradigm following double-blind administration of the MOR agonist morphine, placebo, and the opioid antagonist nalt rexone. We hypothesized that behaviors regulated by the endogenous MOR system would be enhanced by MOR agonism, and decreased by antagonism. The strongest drug effects were expected for the sweetest (high-calorie) sucrose solution, as reported in rodents. However, very sweet sucrose-water solutions are considered sickly and aversive by many people (called sweet dislikers). Since both sweet likers and dislikers were tested, we were able to assess whether MOR manipulations affect pleasantness ratings differently depending on both subjective and objective value. As hypothesized, MOR stimulation with morphine increased pleasantness of the sweetest of five sucrose solutions, without enhancing pleasantness of the lower-sucrose solutions. For opioid antagonism, an opposite pattern was observed for the sweetest drink only. This bidirectional effect of agonist and antagonist treatment is consistent with rodent findings that MOR manipulations most strongly affect the highest-calorie foods. Importantly, the observed drug effects on pleasantness of the sweetest drink did not differ between sweet likers and dislikers. We speculate that the MOR system promotes survival in part by increasing concordance between the objective (caloric) and subjective (hedonic) value of food stimuli, so that feeding behaviour becomes more focused on the richest food available

Anti-luck epistemology and pragmatic encroachment

A distinctive approach to the theory of knowledge is described, known as anti-luck epistemology. The goal of the paper is to consider whether there are specific features of this proposal that entails that it is committed to pragmatic encroachment, such that whether one counts as having knowledge significantly depends on non-epistemic factors. In particular, the plausibility of the following idea is explored: that since pragmatic factors play an essential role when it comes to the notion of luck, then according to anti-luck epistemology they must likewise play an essential role in our understanding of knowledge as well. It is argued that once anti-luck epistemology is properly understood—where this means, in turn, having the right account of luck in play—then this putative entailment to pragmatic encroachment does not go through

Displacement and Resettlement: Understanding the Role of Climate Change in Contemporary Migration

How do we understand displacement and resettlement in the context of climate change? This chapter outlines challenges and debates in the literature connecting climate change to the growing global flow of people. We begin with an outline of the literature on environmental migration, specifically the definitions, measurements, and forms of environmental migration. The discussion then moves to challenges in the reception of migrants, treating the current scholarship on migrant resettlement. We detail a selection of cases in which the environment plays a role in the displacement of a population, including sea level rise in Pacific Island States, cyclonic storms in Bangladesh, and desertification in West Africa, as well as the role of deforestation in South America’s Southern Cone as a driver of both climate change and migration. We outline examples of each, highlighting the complex set of losses and damages incurred by populations in each case

Mapping stone fruit supply chains in North West Vietnam

Stone fruit production is an emerging industry in North-West Vietnam. In 1995, the area under production was estimated at 32,000 hectares. In line with Government planning, this is set to increase to 100,000 ha by 2010 to meet projected domestic demand and export opportunities. To facilitate the development of this industry, high quality varieties and modern fruit production practices have been introduced. However, with post-harvest losses remaining high (25-40%), capitalising on this development will require significant improvements to be made to existing supply chains. In this study, supply chains have been mapped to gain a better understanding of where the major losses occur along the supply chain and to identify where technology or supply chain modifications can best be made to address these issues. Quality deficiencies were identified using a number of approaches including: tracking consignments from farm to market; undertaking a quality audit of local, regional and city markets; and surveying supply chain partners (growers, collectors, wholesalers and retailers). In 2005 and 2006, 10 consignments of Tarn Hoa plum were tracked through the supply chain from Bac Ha to Long Bien Fruit Wholesale market in Hanoi. Each consignment, comprising 5 cartons of fruit (30kg) included temperature and shock loggers to monitor the environment and quality assessments were carried out at each transit point in the supply chain. Whilst overall firmness changed little during transit, sorting and packaging practices led to significant physical damage (28%). Following the 14 hour trip to Hanoi, bruising (24%) and disease incidence (11%) increased dramatically. Quality audits of city, regional and local markets clearly demonstrated a premium for large fruit, with the major defects being bruising, poor colour and poor texture. Surveys of supply chain partners revealed more on the interrelationships between supply chain partners and some of the reasons for current supply chain practices. The implications of these findings on opportunities for modifying Vietnamese temperate fruit supply chains are discussed

Cognitive effects of topiramate, gabapentin, and lamotrigine in healthy young adults [2] (multiple letters)

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