Nutrition-Related Health Conditions

Overview

This guide covers the epidemiology, pathophysiology, risk factors, symptoms, and nutrition-focused management of major nutrition-related health conditions, including diabetes mellitus, cardiovascular disease, hypertension, cancer, lactose intolerance, osteoporosis, and iron deficiency anemia. Understanding these conditions is essential for nutrition students to apply evidence-based dietary strategies in clinical and public health settings.

Diabetes Mellitus (DM)

Pathophysiology and Diagnosis

Diabetes mellitus is a chronic metabolic disorder characterized by high/elevated blood glucose levels due to impaired insulin secretion, insulin action, or both. Diagnostic criteria include:

• Fasting Blood Glucose: ≥ 126 mg/dL

• HbA1C: ≥ 6.4%

Types of Diabetes and Risk Factors

There are two main types of diabetes, each with distinct causes and risk profiles:

Gestational Diabetes Mellitus (GDM)

Gestational diabetes is defined as glucose intolerance with onset or first recognition during pregnancy, typically diagnosed in the second or third trimester. Women with pre-existing diabetes are not classified as having GDM.

Common Symptoms of Diabetes

• Polyuria (increased urination)

• Polyphagia (increased hunger)

• Polydipsia (increased thirst)

• Weight loss

• Blurry vision

• Slow-healing cuts/bruises

Screening and Diagnosis

• Adults with BMI ≥ 25 kg/m² (≥ 23 kg/m² for Asian Americans) and at least one other risk factor should be screened early.

• General population: Begin testing at age 45.

• Repeat testing every 3 years if results are normal, or more frequently based on risk.

Complications of Diabetes

• Microvascular: Retinopathy, nephropathy, neuropathy

• Macrovascular: Cardiovascular disease, stroke

Medical and Dietary Management

• Medical: Insulin, oral glucose-lowering medications, regular monitoring (blood glucose, A1C, lipids, blood pressure, weight), and self-management education.

• Dietary: Individualized meal plan, adequate fiber, limit added sugars and processed foods, promote complex carbohydrates (vegetables, fruits, whole grains, legumes), weight management, and regular exercise to improve insulin sensitivity.

Cardiovascular Disease (CVD)

Pathophysiology and Epidemiology

Cardiovascular disease encompasses disorders of the heart and blood vessels, primarily caused by atherosclerosis (fatty deposits that harden arteries). It is a leading cause of death globally and in the United States.

Risk Factors for CVD

• Elevated blood cholesterol

• Smoking

• Hypertension (high blood pressure)

• Unhealthy diet, physical inactivity, excessive alcohol use

• Obesity, metabolic syndrome, diabetes

• Genetic predisposition, age, stress

Pathophysiology of Atherosclerosis

Atherosclerosis involves injury to the arterial lining, accumulation of plaque (fat, calcium, cholesterol), narrowing of arteries, and potential blockage leading to heart attack or stroke.

Medical and Dietary Management of CVD

• Medical: Cholesterol/triglyceride-lowering drugs, antihypertensives, antiplatelet agents, invasive procedures (angioplasty, stent, CABG surgery).

• Dietary: Emphasize vegetables, fruits, whole grains, low-fat dairy, poultry, fish, legumes, olive oil, and nuts. Limit refined sugars, processed foods, saturated fat (<7%), and eliminate trans fats. Maintain healthy weight and encourage physical activity.

Hypertension (HTN)

Definition and Epidemiology

Hypertension is chronic elevation of blood pressure, affecting about 1 in 3 adults. Many are unaware due to its asymptomatic nature.

Risk Factors for Hypertension

• Genetic predisposition, age, ethnicity

• Obesity, physical inactivity, smoking, alcohol

• Diet high in sodium, low in potassium, calcium, magnesium

• Medications (corticosteroids, estrogens, NSAIDs)

Complications of Hypertension

• Cardiac failure

• Myocardial infarction (heart attack)

• Stroke

• Kidney disease

• Vision problems (retinopathy)

Dietary Approaches to Stop Hypertension (DASH)

• Increase fruits, vegetables, whole grains, low-fat dairy, fish, poultry, beans, nuts, and vegetable oils

• Increase calcium, potassium, fiber

• Limit saturated/trans fats, sugar-sweetened beverages, sweets, and sodium

• Limit alcohol and monitor caffeine intake

Cancer

Epidemiology and Pathophysiology

Cancer is the second leading cause of death among North American adults. Carcinogenesis involves initiation (DNA damage), promotion (cell proliferation), and progression (tumor growth and metastasis).

Risk Factors for Cancer

• Dietary carcinogens (N-nitrosocompounds, acrylamide, polycyclic aromatic hydrocarbons)

• Excess energy intake (macronutrients, alcohol)

• Limited fruit and vegetable consumption

• Radiation, viruses, tobacco/smoking

Cancer Prevention

• Avoid tobacco

• Limit or avoid alcohol

• Stay physically active (150–300 min/week)

• Maintain a healthy weight

• Emphasize fruits, vegetables, whole grains, legumes

• Limit processed foods, red and processed meats

• Prioritize regular sleep and circadian health

• Vaccination (HPV, Hepatitis B), screening (colorectal, breast, cervical)

Lactose Intolerance (LI)

Pathophysiology and Risk Factors

Lactose intolerance results from reduced lactase enzyme activity in the small intestine, leading to impaired digestion of lactose (milk sugar). Risk factors include age, ethnicity, premature birth, small intestine disorders, and prior radiotherapy.

Symptoms and Complications

• Gas, bloating, cramps, pain, diarrhea

• Complications: Malnutrition, osteopenia

Dietary Management

• Most can tolerate moderate lactose (1/2–1 cup milk) especially with other foods

• Hard cheeses and yogurt are better tolerated

• Calcium-rich substitutes: low-lactose milk, fortified plant-based milk, dark leafy greens, canned sardines

• Lactase enzyme supplements may be considered

Osteoporosis

Epidemiology and Pathophysiology

Osteoporosis is a reduction in adult bone mass, causing porous and fragile bones. It is a major public health concern, especially in older adults and postmenopausal women.

Risk Factors

• Older age, female gender, white or Asian ethnicity

• Hormone deficiency (estrogen/androgen)

• Smoking, excess alcohol/caffeine

• Low calcium or vitamin D intake

• Physical inactivity, low body weight, family history

• Long-term medication use (antacids, corticosteroids)

Management

• Balanced diet with adequate calories, calcium, vitamin D, and protein

• Low-fat dairy, leafy greens, fortified foods, fatty fish

• Exercise: Strength/resistance training, balance, and coordination exercises

• Avoid smoking and limit alcohol

Iron Deficiency Anemia

Pathophysiology and Risk Factors

Anemia is a blood disorder characterized by insufficient or dysfunctional red blood cells. Iron deficiency anemia results from long-term iron depletion, leading to impaired hemoglobin synthesis and microcytic red blood cells.

Stages and Diagnosis

• Stage 1: Moderate iron depletion, no dysfunction

• Stage 2: Severe iron depletion, no dysfunction

• Stage 3: Iron deficiency with dysfunction

• Stage 4: Iron deficiency anemia

Diagnosis: Complete blood count (CBC), hemoglobin levels (normal: 13–18 g/dL men, 12–16 g/dL women)

Medical and Dietary Management

• Treat underlying disease

• Oral iron supplements or parenteral iron (IV)

• Diet: Foods high in iron (red meat, poultry, fish, legumes, fortified cereals, leafy greens)

Additional info: For all conditions, patient education and regular follow-up are essential for effective management and prevention of complications.