DASH Diet vs Intermittent Fasting

DASH DietVegetables, fruits, whole grains, low-fat/fat-free dairy, lean protein (poultry, fish), nuts/seeds/legumes a few times a week — defined daily serving counts.

Intermittent FastingNo food-type restriction — any foods within the eating window/days; water, black coffee, or plain tea during fasting hours.

DASH DietTable salt/high-sodium foods, cured and deli meats, canned soups, red meat, full-fat dairy, sugary drinks, sweets — limited by serving count, not excluded outright.

Intermittent FastingNone specifically — timing, not food type, is restricted.

DASH DietNo specific eating window — serving-count structure (6–8 grains, 4–5 vegetables, 4–5 fruits, 2–3 dairy servings/day, etc.) plus a 2,300mg (or 1,500mg) sodium target, based on a 2,000 kcal reference diet.

Intermittent FastingDefines the diet: 16:8 daily time-restricted eating window, 5:2 (two lower-calorie days/week), alternate-day fasting, or Eat-Stop-Eat (one or two full 24-hour fasts/week).

DASH DietLower blood pressure.

Intermittent FastingWeight loss / metabolic health via changing meal timing rather than food choice.

DASH DietPeople with hypertension, prehypertension, or elevated cardiovascular risk who want a produce-and-whole-grain pattern with RCT evidence behind the blood-pressure claim.

Intermittent FastingPeople who find a fixed eating window easier to sustain than counting every meal, or who naturally skip breakfast anyway.

DASH DietNone — no calorie-restriction or macro-ratio mechanism of its own.

Intermittent FastingNone specified — only timing is restricted, not macro ratios.

DASH DietHypertension/prehypertension, cardiovascular risk; secondary cohort evidence for lower kidney stone risk.

Intermittent FastingSome improvements in insulin sensitivity, blood pressure, and cholesterol in certain trials; no advantage shown over plain calorie restriction in several recent RCTs.

DASH DietStrong — an NIH-developed clinical intervention, with controlled feeding trials (original 1997 trial, DASH-Sodium) through large long-term cohorts.

Intermittent FastingMixed — weight loss broadly comparable to calorie restriction, but several well-designed recent trials (TREAT; NEJM 2022) found no added benefit over calorie restriction alone.

DASH DietModerate — works through serving-based targets and a sodium ceiling rather than food bans, but hitting the sodium target usually means cooking more from scratch.

Intermittent FastingModerate — no food is off-limits, but timing has to be maintained; not recommended without medical supervision for disordered-eating history, pregnancy, type 1 diabetes, or children.

DASH DietFresh produce plus lean protein can raise grocery cost and prep time versus processed staples; dairy servings may not suit anyone lactose-intolerant or vegan without substitution.

Intermittent FastingNo special foods required — flexible and affordable, since only timing changes.