FSHN exam 3

Gut Microbiome & Fermented Foods

1. Diverse Gut Microbiome

   • A diverse gut microbiome means having a wide variety of beneficial microorganisms (like bacteria) in the gut, which supports digestion, immunity, and overall health.

   • Dietary changes for diversity: Increase fiber intake from fruits, vegetables, whole grains, and legumes, and include a variety of foods to introduce different beneficial bacteria.

   • Importance of diversity: A diverse microbiome helps reduce inflammation, supports immune function, and may lower the risk of chronic diseases like obesity and diabetes.

2. Benefits of Fermented Foods (Stanford Study, 2021)

   • Examples of fermented foods: Yogurt, kefir, sauerkraut, kimchi, kombucha, and miso.

   • Study benefits: Participants consuming high amounts of fermented foods showed increased microbiome diversity and reduced inflammatory markers.

3. Probiotic Supplements

   • Reputable source importance: Ensures the supplement contains the claimed bacteria, as probiotics aren’t tightly regulated and might lack quality control.

   • Regulation: Probiotics are regulated as dietary supplements, not drugs, so they aren’t subject to the same safety and efficacy standards as medications.

4. Concerns with Probiotics Post-Antibiotics

   • Israeli research findings: Standard probiotics can delay the natural restoration of the gut microbiome after antibiotics.

   • Personalized probiotics: Evidence suggests that customizing probiotics for an individual’s microbiome may better restore gut health.

Carbohydrates: Forms and Sources

1. Energy in Foods

   • Energy in food is stored in carbohydrates, fats, and proteins.

2. Types of Carbohydrates by Structure

   • Monosaccharides, disaccharides, polysaccharides: Simple carbs include mono- and disaccharides (sugars), while polysaccharides (like starch and fiber) are complex.

   • Non-energy carb: Dietary fiber does not provide energy as it isn’t fully digestible.

3. Common Sugars and Sources

   • Examples: Glucose, fructose, sucrose.

   • Sources: Table sugar, fruits, and sweetened beverages.

   • Leading sources: Soft drinks are the top source of added sugars; fruits are the leading source of dietary fructose.

4. Sugary Drink Limits (American Heart Association)

   • Recommendation: Limit sugary drinks to 1 eight-ounce serving or less per week for children and teens.

5. Added Sugar Calculation

   • Conversion: 12 grams of added sugar equals 3 teaspoons (1 teaspoon = 4 grams).

6. Beverage Consumption Trends in the U.S.

   • Specialty coffee consumption is highest among young adults.

   • Teens are leading the decline in soft drink consumption.

   • Guidelines recommendation: Water instead of sugary drinks.

   • Health benefit: Reduced calorie intake, which may help prevent weight gain.

7. Recommended Milk/Dairy Servings and Nutrients

   • Servings: 3 cup-equivalents per day.

   • Key nutrients: Calcium, vitamin D, and potassium (shortfall nutrients).

Health Risks Linked to Soft Drinks

1. Empty Calories

   • Definition: Foods high in calories but low in nutrients.

   • Other sources: Candy, pastries, and fried foods.

2. Soft Drinks and Obesity

   • High calorie content with little satiety leads to overconsumption.

   • Example: A 20-ounce soft drink requires approximately 4-5 miles of walking to burn off.

   • Compensation study: People do not reduce other food intake to balance liquid calories, leading to weight gain.

3. Soft Drinks and Type 2 Diabetes

   • Mechanism: Frequent consumption raises blood sugar and insulin levels, promoting insulin resistance, a key factor in diabetes.

   • Not solely due to obesity; sugary drinks themselves raise diabetes risk.

4. Heart Disease Risk Factors and Sugary Drinks

   • High sugary drink intake can increase blood triglycerides and blood pressure.

   • Affected age groups: All ages, especially young adults.

   • AHA position: Limit sugary intake to reduce heart disease risk.

5. Fatty Liver Disease and Ectopic Fat

   • Definition: Accumulation of fat in the liver (ectopic fat) linked to belly fat.

   • Health impact: Reduces insulin sensitivity, raises triglycerides, contributing to heart disease and diabetes.

6. Fructose and Fatty Liver

   • Fructose metabolism: Excess fructose in sugary drinks contributes to liver fat more than glucose.

   • Evidence: Studies show higher fatty liver rates with high-fructose diets.

7. High Fructose Corn Syrup vs. Sugar

   • Metabolically similar; both lead to fructose and glucose in the body after digestion.

   • No strong evidence that HFCS is worse than sugar.

8. Policies to Reduce Sugary Drink Intake in Youth

   • Examples: Taxes on sugary drinks, restrictions on marketing to children, and clearer labeling on sugar content.

Dietary vs. Functional Fiber

1. Types of Complex Carbohydrates

   • Starch, glycogen, fiber.

   • Glycogen function: Stored in liver and muscles for quick energy release.

2. Dietary Fiber vs. Functional Fiber

   • Dietary fiber: Found naturally in plants.

   • Functional fiber: Added to foods for specific benefits (e.g., inulin).

3. Examples of Functional Fibers

   • Inulin and soluble corn fiber: Often added to foods for prebiotic benefits and digestive health.

4. Poppi Prebiotic Soda Lawsuit

   • Claims overstated health benefits of prebiotics in soda.

   • Health benefits of prebiotics: Mixed evidence, particularly in sodas.

Health Benefits of Dietary Fiber

1. Focus on Dietary Fiber in Guidelines

   • Emphasized over functional fiber due to whole-food benefits like reduced risk of heart disease and diabetes.

   • Sources: Whole grains, fruits, vegetables, legumes.

2. Health Benefits of Fiber

   • Promotes digestion, heart health, weight management.

   • Fiber intake recommendations aim to support digestive health and lower chronic disease risk.

   • Population adherence: Less than 5% of Americans meet fiber recommendations.

3. Fiber and Chronic Disease Risk in Teens

   • Low fiber increases future risk for metabolic syndrome, heart disease.

   • Metabolic syndrome: Cluster of symptoms that increase heart disease risk.

   • Prevalence in teens: Approximately 10-15%.

4. Weight Management and Fiber

   • Benefit: Increases satiety, helps with weight control.

5. Ultra-Processed Food Intake

   • Calories: Around 60% of American calories are from ultra-processed foods.

   • Definition: Foods with additives, preservatives, artificial ingredients.

6. Characteristics of Ultra-Processed Foods

   • Common traits: High in sugar, fat, salt, low in fiber, highly palatable.

7. Health Risks of Ultra-Processed Diets

   • Increased risk of obesity and metabolic diseases.

   • NIH study findings: People on ultra-processed diets tend to eat more and gain weight.

8. Benefits of Soluble and Insoluble Fiber

   • Soluble fiber: Lowers cholesterol; found in oats, beans.

   • Insoluble fiber: Promotes digestion; found in whole grains, vegetables.

Sweeteners & Health Concerns

1. Safety of Low-Calorie Sweeteners

   • Approved by organizations like the FDA when consumed in moderation.

2. Identifying Low-Calorie Sweeteners on Labels

   • Check ingredients list; some groups advocate for clearer labeling.

3. Israeli Study on Artificial Sweeteners (2022)

   • Daily consumption of saccharin and sucralose linked to glucose metabolism issues.

   • Mechanism: Alters gut microbiome, which may raise diabetes risk.

4. Erythritol Concerns

   • Linked to possible negative effects on cardiovascular health.

   • Labeling: Not required on Nutrition Facts but often in ingredients.

Carbohydrate Digestion and Absorption

1. Start of Carbohydrate Digestion

   • Begins in the mouth with salivary amylase.

2. Carbs That Don’t Require Digestion

   • Monosaccharides (like glucose) are absorbed directly.

   • Fiber cannot be digested by human enzymes.

3. Starch Digestion Site

   • Mainly in the small intestine via pancreatic amylase.

4. Liver's Role in Glucose Regulation

   • Buffers blood glucose extremes, stores glycogen for release during fasting.