health
LDL Cholesterol Increase
Adverse effectLDL Cholesterol Increase means a rise in the amount of LDL cholesterol. It is an adverse health outcome rather than a symptom or diagnosis in itself, and it may occur alongside changes in other blood lipids.
See what the health term LDL Cholesterol Increase refers to and how it is presented in a wellness reference.
These are research findings, not promises. Most options have little evidence, and results differ from person to person.
What can cause it
How likely each one is to cause it, most likely first.
FastingpracticePossible
Based on 2 studies. Strongest study: a pooled analysis of several trials.
A 2025 pooled analysis whose study designs were not recorded found that whole-day fasting resulted in an LDL cholesterol increase of 0.11 mmol/L compared with time-restricted eating. A 2026 review also described elevated LDL cholesterol with prolonged alternate-day fasting.
Open the Fasting page
The expert view shows every study, dose protocol and source.
What can cause it
Interventions reported to bring this on1 listedHighest probability
- →PracticesFastingCertaintyMediumSourceClinical2 other sources
A 2025 pooled analysis whose study designs were not recorded found that whole-day fasting resulted in an LDL cholesterol increase of 0.11 mmol/L compared with time-restricted eating (95% CI 0.01 to 0.21). A 2026 review also described elevated LDL cholesterol with prolonged alternate-day fasting.
Who was studied
- People with a condition
Open FastingStudy result
Whole day fasting resulted in a small increase in low density lipoprotein cholesterol compared with time restricted eating (mean difference 0.11 mmol/L (95% CI 0.01 to 0.21), low certainty of evidence).
How to read the evidence
Evidence tier — overall strength of the evidence for the whole compound
- StrongWell established — backed by strong, consistent human research.
- ModerateSome genuine support, but mostly from small or lower-quality studies. Promising, not proven.
- PreliminaryEarly-stage evidence — a promising hypothesis, not an established effect yet.
- LimitedVery limited evidence — treat this as a hypothesis, not proof.
- InsufficientNot enough good evidence to draw conclusions yet.
Certainty — how sure we can be that the effect is real
- Very highVery sure — strong, consistent evidence
- HighFairly sure — consistent evidence from good studies
- MediumModerately sure — new studies could change this
- LowNot sure — little or mixed evidence
- Very lowVery unsure — almost no usable evidence
Source — where the data comes from
- Meta-analysisPooled analysis of many trials — the strongest evidence
- RCTRandomized controlled trial — a strong human study design
- ClinicalA human clinical study
- Reference knowledgeFrom general health-science or pharmacology references, not a study of this exact claim
- Animal researchStudied in animals, not humans
- Community reportsAggregated user reports — anecdotal signal, not evidence
- TheoreticalMechanism-based reasoning, not yet tested
Study grade — quality of each underlying study (A best, D weakest)
- AHigh-quality — strong, consistent human trials
- BGood — solid evidence with some limitations
- CModerate — limited, small, or mixed-quality studies
- DWeak — preliminary, indirect, or animal-only
Confidence — how strongly the sources back a finding
A 0–100 score from study quality and agreement
Most supplement evidence is graded C–D. Read it as preliminary signal, not proof.
Full write-up
What is it
LDL Cholesterol Increase means a rise in the amount of LDL cholesterol. It is an adverse health outcome rather than a symptom or diagnosis in itself, and it may occur alongside changes in other blood lipids. DHA-containing omega-3 products may modestly raise LDL cholesterol in some people, particularly when triglycerides are markedly elevated, even while lowering triglycerides.
How interventions help
The interventions do not appear to affect LDL cholesterol in exactly the same way. The findings for Omega-3, Cod Liver Oil, and Krill Oil are most relevant to products containing DHA: LDL cholesterol may rise modestly in some people, particularly when these products are used to lower markedly elevated triglycerides. This can occur even when triglycerides decrease, so changes in the two cholesterol measures may not move in the same direction.
For Omega-3, the observed finding came from studies using <1000 mg/day for ≤8 weeks. This describes the time and dose used when the change was observed; it does not establish whether the change persists after stopping or whether the same pattern applies to longer use. The information also does not establish a consistent onset time. Findings involving different products should therefore be interpreted according to their formulation and the reason for use, rather than treating all interventions as interchangeable.
Choosing guidance
For readers comparing these options specifically in relation to LDL cholesterol, Omega-3 has the clearest clinical basis, including research involving people with lipid-related and cardiovascular conditions. That evidence reflects relatively short-term use and a defined daily amount, so it does not establish whether the same pattern appears with longer use or different amounts. It also does not provide a basis for choosing among these options by speed of onset.
Cod Liver Oil and Krill Oil are described in relation to the shared feature of DHA-containing omega-3 products: LDL cholesterol may rise modestly in some people, particularly when triglyceride levels are markedly elevated or when triglyceride-lowering amounts are used. This provides a reason to consider the product’s omega-3 composition and the lipid outcome being targeted, rather than assuming that all omega-3 sources will have identical effects. The available descriptions do not establish whether Cod Liver Oil or Krill Oil acts faster, requires less product, or is preferable for a particular duration of use.
Zinc is different from the omega-3 options because the reported connection is based on a community report rather than a defined clinical evidence base. It therefore does not establish how often the effect occurs, how quickly it develops, or whether it would recur consistently. People choosing among these options may find Omega-3 most relevant when they want clinical evidence in populations with lipid conditions, while Cod Liver Oil and Krill Oil warrant attention to their DHA content. Zinc should be treated as an uncertain association rather than a well-characterized alternative for this effect.