Intermittent Fasting vs Paleo Diet

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

Paleo DietGrass-fed beef, chicken, wild-caught salmon, eggs, almonds, walnuts, pumpkin seeds, berries, apples, leafy greens, broccoli, sweet potatoes, olive oil, avocado.

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

Paleo DietWheat bread and pasta, rice, oats, beans and lentils, peanuts, milk, cheese and yogurt, table sugar, chips, and packaged snacks.

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).

Paleo DietNo specific eating window — restricts food categories, not calories, macros, or timing.

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

Paleo DietGeneral health by cutting processed foods, added sugar, and refined carbs, modeled on ancestral eating.

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

Paleo DietPeople who feel or perform better cutting out processed foods, added sugar, and refined carbs generally, regardless of whether the ancestral framing itself holds up.

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

Paleo DietNone specified — restricts food categories, not macro ratios.

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

Paleo DietModest improvements in glucose tolerance (small RCT in people with ischemic heart disease), weight, waist circumference, blood pressure, and lipids in a meta-analysis — evidence the study authors themselves call “not conclusive.”

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.

Paleo DietLimited/thinner — real but noticeably thinner and shorter-term than Mediterranean or DASH; a supporting meta-analysis had published calculation-error concerns, and the “one ancestral diet” premise has been directly challenged in the scientific literature.

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.

Paleo DietHigh — restricts entire food categories (grains, legumes, dairy) rather than counting anything.

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

Paleo DietPaleo-compliant meat, fish, nuts, and produce typically cost more than the grain, legume, and dairy staples it excludes.