Diets
time-restricted eating improves LDL cholesterol and triglycerides
In plain terms: Does time-restricted eating meaningfully improve your cholesterol and triglycerides?
Part of: 🥗 time-restricted eating
Weakly and inconsistently — some trials show small drops in triglycerides or LDL, but pooled evidence is mixed and much of any benefit appears driven by weight loss rather than meal timing itself.
📅 Last reviewed: 2026-07-15 ⓘ
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
How the studies fall
What the evidence shows
The lipid case is weak and inconsistent. A meta-analysis of thirteen randomised trials in 612 overweight and obese women found no significant effect on blood lipids, and where improvements appear they are small, often from Ramadan-fasting studies, or confounded by an added exercise arm. Weight loss, not meal timing, carries most of what is seen.
The evidence (14)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Wang XY, Chen J, Li H 2025 · Journal of the International Society of Sports Nutrition | RCT | contradicts | moderate | 142 postmenopausal women, 8wk, 3-arm RCT: TRE+Tai-Chi > TRE-alone (p=0.030) and > control (p=0.000) for LDL-C; TRE-alone vs control LDL-C difference not separately reported. |
| Motiwala Z, Sarker P, Hliebov O 2025 · Cureus | meta-analysis | mixed | low | Meta-analysis of Ramadan fasting in South Asians found lowered LDL/total cholesterol but no significant triglyceride change. |
| Chen S, Zhang X, Kortas J, Liu H 2025 · Frontiers in nutrition | meta-analysis | contradicts | high | MA of 13 RCTs, n=612 overweight/obese women: TRE 'showed no significant effects on ... blood lipids ... (p>0.05)' despite significant reductions in body weight and fasting insulin. |
| Barve RA, Veronese N, Bertozzi B, Tosti V, Cagigas ML, Spelta F, Cava E, Piccio L, Early DS, Head RD, Fontana L 2025 · Nat Commun | RCT | mixed | low | 6-month intermittent fasting RCT produced significant reductions in LDL, non-HDL cholesterol and triglycerides alongside 8% weight loss. |
| Soltanova L, Iseri C, Sahin S, Kara M, Guclu SA, Yesilova B, Muradov I, Kocaman BB, Kadioglu P 2026 · Nutrients | observational | tested-null | low | TRE 10am-6pm, 12wk, 9 Cushing's-remission adults with obesity: 'No statistically significant changes were observed in fasting glucose, HbA1c, or lipid parameters' despite significant weight/BMI loss. |
| Popiolek-Kalisz J, Kwasny A 2026 · Nutr Metab Cardiovasc Dis | meta-analysis | mixed | moderate | Umbrella review, units are syntheses: 'Fifty-seven meta-analyses met the inclusion criteria.' 'The evidence suggests that TRE may modestly reduce TG levels, particularly in overweight individuals, with a limited impact on LDL-C, HDL-C, and TC.' Review — zero weight. |
| Santos HO, Macedo RCO 2018 · Clin Nutr ESPEN | observational | mixed | low | Review found IF (mostly Ramadan/observational) may lower total cholesterol, LDL and TG and raise HDL, but effects were confounded by diet and weight loss and lacked large RCTs. |
| Wong PS, Wan K, Dai Z, Yu AP, Wong SH, Poon ET 2025 · Nutrition Reviews | meta-analysis | mixed | moderate | Meta-analysis of 16/8 TRE found modest glycemic benefit but weak/inconsistent effects on lipid profile. |
| Semnani-Azad Z, Khan TA, Chiavaroli L, Chen V, Bhatt HA, Chen A, Chiang N, Oguntala J, Kabisch S, Lau DC, Wharton S, Sharma AM, Harris L, Leiter LA, Hill JO, Hu FB, Lean ME, Kahleová H, Rahelic D, Salas-Salvadó J, Kendall CW, Sievenpiper JL 2025 · BMJ | meta-analysis | contradicts | high | Network meta-analysis of intermittent fasting found small cardiometabolic benefits largely tracking weight loss, with limited independent lipid improvement. ⚠️ correction-on-file (Crossref) - kept, corrigendum not retraction |
| Sutton EF, Beyl R, Early KS, Cefalu WT, Ravussin E, Peterson CM 2018 · Cell Metab | RCT | tested-null | moderate | In weight-maintained eTRF crossover (prediabetic men), lipids (cholesterol, TG) did NOT significantly improve, arguing lipid benefits are not intrinsic to meal timing absent weight loss. |
| Wang B, Wang C, Li H 2025 · Nutr J | meta-analysis | mixed | moderate | RCT meta-analysis in overweight/obese adults found inconsistent lipid effects for IF vs continuous energy restriction, with no reliable superiority for TG or LDL. |
| Yi X, Yan J, Daut UN, Abas R, Raja Muhammad Rooshdi RAW, Yang C, Liu C 2025 · Frontiers in Nutrition | meta-analysis | contradicts | moderate | TRE without caloric restriction showed limited/inconsistent lipid changes in non-diabetic adults, with lipid endpoints weaker than BP or glucose effects. |
| Lu X, You J, Xia T, Xu R 2026 · Diabetol Metab Syndr | meta-analysis | mixed | moderate | Meta-analysis in type 2 diabetes found TRE reduced triglycerides but did NOT significantly change total or LDL cholesterol. |
| Sun Y, Shang M, Zhang Y, Hu J, Wang H 2025 · Sci Rep | meta-analysis | contradicts | low | Network meta-analysis ranked carbohydrate-restricted diets (not IF/TRE) best for lipid modulation and HDL; TRE/IF was not a leading lipid-lowering pattern. |
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