1 Neural Systems Involved in Food Intake: An Integrative Overview Stephen C. Woods* Department of Psychiatry and Behavioral Neuroscience University of Cincinnati * No conflicts to report ILSI North America Miami, January 2013
2 Each day, each of us must address several important questions regarding our food intake. When to eat? What to eat? How much to eat? While some of the answers are decided consciously, many are not.
3 This presentation will deal with when we eat and how much we eat, whereas Drs. Breslin and Avena will discuss factors that determine what we eat, and Dr. Gómez-Pinilla will discuss what food does to the brain.
4 Why do we eat? Homeostatic Reasons To provide necessary energy for the body Thus, our food intake should be matched to our energy expenditure.
5 Alternatively, we often eat for non-homeostatic reasons. How Hedonics homeostatic and non-homeostatic Habits influences interact? Opportunity Social reasons Other
7 Homeostatic Controls Hypothalamus Non-Homeostatic Controls Anxiety, social situation, learning, hedonics, etc. Cortex Amygdala, Accumbens, etc. Brainstem Both food and drugs Brainstem of abuse activate circuits in both circuits. There is considerable overlap, and perhaps inter- Behavior ference, between the Behavior two.
8 The Dilemma Kg Decades
9 Key points about obesity It s not a novel condition. Its incidence is increasing, and has been called an epidemic.
10 Key points about obesity It s not a novel condition. Its incidence is increasing, and has been called an epidemic. It is thought by many to reflect a failure of regulation.
11 Key points about obesity It s not a novel condition. Its incidence is increasing, and has been called an epidemic. It is thought by many to reflect a failure of regulation. It is usually associated with increased food intake.
14 Accuracy! Energy intake in 1 year 955,570 calories Error of 0.4% or 11 calories/day* Gaining 1 pound (0.45 kg) in 1 year ~4000 calories
15 Thus, there are two apparently conflicting points of view. Clinical and experimental evidence suggests that body weight is tightly regulated; in contrast, population evidence says that average body weight is gradually increasing. This reflects a fundamental tension between homeostatic and non-homeostatic controllers of food intake.
16 How do we eat? Meals Meal patterns Does the pattern matter? Nibblers vs. gorgers
17 What determines when we eat, especially when food is always available? Habit Convenience Opportunity
18 What determines how much we eat during a meal?
19 Important Point about the Control of Meals Factors that control when meals will occur differ from factors that control when meals will end. Different signals control meal initiation and meal size.
20 To Reiterate For most instances of food intake in humans and experimental animals, meal initiation is not controlled by metabolic or hormonal signals. Under normal circumstances, meal initiation is based upon learning, habits, convenience, or the social situation. There is compelling evidence that meal cessation (meal size) is controlled in part by signals from the gastrointestinal tract.
21 What is known of the factors that influence meal size? In Historically, the 1970s, GI single hormones, factors and such especially as gastric peptide contractions hormones, blood were glucose thought were to be thought likely mediators be major of food determinants intake, and of in both 1973, the it start was reported and completion that exogenous of meals. administration of the gut peptide, CCK (cholecystokinin), which is secreted But research during did meals, not support reduces these meal size. ideas.
22 This experiment was the first to implicate metabolic hormones in the control of food intake, and it ushered in the modern era of research on the energetics of eating. Meal size / Veh * CCK J Gibbs et al., JCPP, 84:488,1973
23 Control of meal size FOOD INTAKE GUT (-) SENSOR METABOLIC EFFECTS (+) (+) (+) GASTROINTESTINAL PEPTIDES SATIATION SIGNALS e.g., CHOLECYSTOKININ (CCK)
24 Reduction of meal size by CCK 30-Minute Food Intake DOSE After J Gibbs & GP Smith, 1976
26 Features of satiation signals Secreted during meals, create a sensation of fullness or satiation Reduce meal size without causing malaise
27 Features of satiation signals They are efficacious in humans
28 Reduction of meal size in humans administered IV CCK Subjects Δ from Control Reference Men -3% Kissileff, AJCN, 1981 Obese Men -24% Pi-Sunyer, PB, 1982 Men -39% Muurahainen, PB, 1988 Men, Women -32% Muurahainen, AJP, 1991 Men, Women -8% Geary, AJP, % Geary, AJP, % Geary, AJP, 1992 Obese Women -31% Geary, AJP, 1992 Men, Women -20% Lieverse, Gut, 1995 Men -21% Ballinger, Clin Sci, 1995 Men -7% Gutzwiller, AJP, 2000
29 Features of satiation signals Blocking their action leads to increased meal size
30 The CCK-A receptor antagonist, loxiglumide (22 μmol/kg, iv), increases caloric intake in men 2000 P < SAL LOX Adapted from Beglinger C. Am J Physiol 2001;280:R1149-R1154.
31 Features of satiation signals Most are made in both the GI tract and the brain
32 Satiation signals Can they be used to treat obesity?
33 CCK REDUCES THE SIZE OF EVERY MEAL PERCENT OF CONTROL 100 MEAL SIZE 50 CONTROL CCK West et al., AJP 246:R
34 CCK INCREASES THE NUMBER OF MEALS PERCENT OF CONTROL MEAL NUMBER CONTROL CCK West et al., AJP 246:R
35 CCK, GIVEN ALONE, HAS NO NET EFFECT ON FOOD INTAKE OR BODY WEIGHT IN FREELY FEEDING RATS PERCENT OF CONTROL MEAL SIZE MEAL NUMBER DAILY INTAKE CONTROL CCK CONTROL CCK CONTROL CCK West et al., AJP 246:R
36 The Peptide-Signal Model of Food Intake SC Woods et al., Science, 1998; MW Schwartz, SC Woods et al., Nature, 2000
37 Satiation signals are relayed to the hindbrain mainly via the vagus nerves Satiation System MW Schwartz, SC Woods et al., Nature, 2000
38 Adiposity signals circulate in the blood and enter the brain at the hypothalamus Adiposity System MW Schwartz, SC Woods et al., Nature, 2000
39 Humoral signal regulation of adiposity CNS Regulatory Mechanisms Food Intake, Energy Expenditure Adiposity Hormones (Insulin & Leptin) Stored Calories
40 This homeostatic model of food intake makes it seem overly deterministic. MW Schwartz, SC Woods et al., Nature, 2000
41 Non-Homeostatic Influences on Food Intake Social Circadian Emotional Hedonic/ Reward Cognitive/ learned Past experience MW Schwartz, SC Woods et al., Nature, 2000
42 Homeostatic Controls Adiposity Signals: Insulin, Leptin BRAIN Hypothalamus Brainstem Adiposity signals act by increasing the potency of satiation signals. Food Intake Satiation Signals: CCK, etc. Behavior CCK CCK + Ins/ Lep CCK -Ins/ Lep
43 Homeostatic Controls Adiposity Signals: Insulin, Leptin BRAIN Hypothalamus Brainstem Non-Homeostatic Controls Anxiety, social situation, learning, hedonics, etc. Cortex Amygdala, Accumbens, etc. Satiation Signals: CCK, etc. Behavior Behavior Non-homeostatic signals also act by increasing the potency of satiation signals.
44 Homeostatic Controls Adiposity Signals: Insulin, Leptin BRAIN Hypothalamus Brainstem Non-Homeostatic Controls Anxiety, social situation, learning, hedonics, etc. Cortex Amygdala, Accumbens, etc. Satiation Signals: CCK, etc. Behavior Behavior And adiposity signals in turn alter the potency of non-homeostatic signals.
46 Ghrelin Increases before meals Via CNS, primes GI tract for meal Increases smell sensitivity Makes food taste better Enhances reward value of food Stimulates eating
47 The controls over food intake are probabilistic, not fixed. Non-homeostatic factors can overwhelm the otherwise rigorous controls over food intake and body weight.
49 The Puzzle If energy homeostasis is regulated so precisely, Does this imply the existence of a set point? Is the control system overwhelmed by environmental factors?
50 Evidence suggests that there is a body weight range rather than a body weight set point Upper Level of Acceptability Body Weight (Fat) Obesity Epidemic Environmental Influences: Stress Palatability Exercise Lower Level of Acceptability Age Upper and lower boundaries are genetically and ontogenetically determined.
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