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PSYCH 3F03 (153)


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Paul W Andrews

February 4 3F03 Starvation • All organisms face a constant threat of it • Survival depends on outlasting periods of deprivation • During starvation—non-essential functions are down-regulated o Immune system o Growth o Reproduction Starvation in Bacteria • White cells depict exponential phase • Dark is the stationary phase (more dormant—devoted to maintaining survival) o More recent research—when in stationary starvation mode have a high tolerance to antibiotics Reduction in Body Temperature • Men that experienced a period of starvation for 4 weeks o Long term food deprivation o We see body temperature cool over period of starvation—as food comes in—body temperature rises to normal again Immune Function and Efficiency • Examines well nourished children and malnourished children • Looking at t-lymphocyte cells—malnourished children do not have the same amout Locomotor activity up regulated across species • More about energy being located for foraging behaviour than anything else—stationary behaviour won’t help you find food. • Flies who have been food deprived • Locomotor activity is measured through being able to get through boxes o Starved flies are more able to get through to box 4—increased foraging behaviour Leptin • Less body fat will be released if you have less • Helps with starvation “accumulated fat” Starvation and Hyperactivity in Rats • Given time to just eat whatever they wanted to • If starving—they’ll do anything • Open—rats given leptin o Able to eat at their own pleasure—no difference o In that where they are not given any food—their activity level will increase Survival Strategies in Humans • During starvation, humans are able to switch off non-essential processes • Reproduction downgraded • Behavioural and psychological traits Sex Differences • Does a predictive model of how males and females would live under the conditions of famine • In body fat hypothesis—women have more body fat then men o We have more energy reserves than men o Males have a higher muscle to fat ratio 
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