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Dash diet in psm
The DASH (Dietary Approaches to Stop Hypertension) diet is a well-established dietary pattern studied in Preventive and Social Medicine (PSM). It emphasizes fruits, vegetables, whole grains, low-fat dairy, and reduced sodium, and is primarily used to manage hypertension without medication.
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Here is a thorough breakdown of the DASH Diet as it appears in PSM (Preventive & Social Medicine) and clinical nutrition topics:
DASH Diet (Dietary Approaches to Stop Hypertension)
What is It?
The DASH diet is a dietary pattern specifically formulated to lower blood pressure (BP). It was developed and validated through controlled feeding trials and is now widely recommended as first-line non-pharmacological management of hypertension.
- High in: vegetables, fruits, whole grains, low-fat dairy, nuts/legumes
- Low in: saturated fat, total fat, cholesterol, sodium, sweets, red meat
Composition (Daily Servings)
| Food Group | Servings |
|---|---|
| Grains/grain products | 7-8/day (or 6-11 based on calorie level) |
| Vegetables | 4-5/day |
| Fruits | 4-5/day |
| Low-fat dairy products | 2-3/day |
| Meats, poultry, fish | 2-3/day (max 3-6 oz/day) |
| Fats & oils | 2-3/day |
| Nuts, seeds, legumes | 4-5/week |
| Sweets | 5/week (or max 2/day) |
(Symptom to Diagnosis, 4th Ed., Table 23-5)
Blood Pressure Reduction (Key Exam Data)
| Non-pharmacological Intervention | Approximate Reduction in Systolic BP |
|---|---|
| DASH diet | 8-14 mm Hg |
| Weight reduction | 1 mm Hg per 1 kg weight loss |
| Reduced sodium (<2.4 g/day) | 2-8 mm Hg |
| Increased potassium (3500-5000 mg/day) | 2-5 mm Hg |
| Aerobic exercise (30 min/day) | 4-9 mm Hg |
| Limiting alcohol | 2-4 mm Hg |
The DASH diet gives the highest BP reduction (8-14 mm Hg) among dietary modifications - an important fact for PSM exams.
(Symptom to Diagnosis, 4th Ed.)
Mechanism & Evidence
- In the original 8-week feeding trial, DASH reduced SBP/DBP by 5.5/3.0 mmHg vs. a usual US diet.
- In longer-term 6-month behaviour change trials, DASH combined with other lifestyle measures reduced SBP by ~4 mmHg.
- With good adherence, expected average SBP reduction:
- ~5 mmHg in patients WITH hypertension
- ~2-3 mmHg in patients WITHOUT hypertension
- Sodium restriction (<2 g/day) combined with DASH gives additional BP reduction.
- Evidence also shows lower risk of stroke, cardiovascular mortality, and myocardial infarction with DASH adherence.
(Harrison's Principles of Internal Medicine 22E; Textbook of Family Medicine 9e)
Sodium Restriction with DASH
- Standard DASH: sodium < 2.4 g/day
- Enhanced DASH (DASH-Sodium): sodium < 1.5 g/day
- A meta-analysis noted sodium-restricted diets, while lowering BP, were associated with increased plasma renin, aldosterone, cholesterol, and triglycerides - a point to note.
DASH vs. Mediterranean Diet (Comparison)
| Feature | DASH | Mediterranean |
|---|---|---|
| Whole grains, fruits, vegetables | High (both) | High (both) |
| Low-fat dairy | High | Low |
| Fish | Not explicit | Yes |
| Olive oil | Not explicit | Yes |
| Primary goal | Blood pressure reduction | CVD/cancer prevention |
Indications (PSM Relevance)
- First-line treatment for prehypertension and early Stage I hypertension (before drugs)
- Non-pharmacological management of hypertension (a key PSM topic)
- Also shown to benefit: metabolic syndrome, CKD progression, kidney stone prevention, and cardiovascular disease prevention
Recent Evidence (2024-2025)
A Cochrane systematic review (2025) confirmed the DASH diet's role in primary and secondary prevention of cardiovascular diseases. A 2024 meta-analysis in Nutrients found DASH to be effective for metabolic syndrome compared to other dietary approaches. No major contradictions to standard teaching - current evidence reinforces DASH as a top-tier dietary intervention.
PSM Exam Tip: The DASH diet is frequently asked in the context of:
- Non-pharmacological management of hypertension
- The magnitude of BP reduction (8-14 mm Hg systolic - highest among dietary interventions)
- First-line treatment for prehypertension/Stage I hypertension
- Composition - especially its high dairy, high fruits and vegetables, and low sodium content
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