She ate for her heart. Her triglycerides still climbed.

Persona

Fatima, 56, Female, North African / Moroccan, Retired teacher.

Her triglycerides have stayed high for five years despite fish, olive oil, vegetables, and avoiding red meat. Her cardiologist is considering medication, and she wants to know why the diet did not work.

Family history: Father: myocardial infarction at age 67.

Clinical picture

Symptoms

• No chest pain or exertional symptoms
• Mild fatigue, especially in the afternoons
• Occasional brain fog — she attributes it to retirement adjustment

Labs

• Triglycerides: 120 mg/dL (<66 mg/dL)
• Omega-3 Index: 4.2% (>8% (optimal))

Medications

• No prescription medications (cardiologist considering fibrates or statins)

Supplements

• Occasional fish oil — low dose, irregular

Lifestyle

• Diet: salmon twice a week, olive oil exclusively, minimal red meat, plenty of vegetables
• Non-smoker
• Alcohol: 1–2 glasses of wine per week
• Moderate activity — daily walks, no structured exercise

Genetics

• FADS1 Reduced-function variant (Reduced-function allele): Fatima may eat omega-3 foods, but her body is poor at turning some of them into the EPA form her heart needs.
• FADS2 Reduced-function variant (Reduced-function allele): This result slows the start of the same conversion chain, so the whole pathway delivers less usable EPA and DHA.
• APOE ε3/ε4 (One copy of ε4): This result can make dietary fats harder to clear, which makes getting the right omega-3 form more important for her.

Five years of doing what she was told

Fatima changed her diet after her father's heart attack. Salmon twice a week. Olive oil instead of butter. Vegetables at every meal. Almost no red meat. Her cardiologist told her to keep going. Five years later, her triglycerides are still high, and her omega-3 index is low. Now medication is on the table. She is frustrated because she did what she was told, and the numbers did not move.

The omega-3 clue

The mystery is that not all omega-3 acts the same way. Plant omega-3s and some food sources need to be converted into EPA and DHA, the long-chain forms most tied to triglycerides and heart health. That conversion is limited even in many healthy people. Fatima's omega-3 index shows the result directly: despite years of omega-3 foods, her EPA and DHA level is still low.

Her body was not converting enough

The issue was not discipline. It was conversion. Her FADS1 and FADS2 results sit at the start and end of the omega-3 conversion chain, so less short-chain omega-3 becomes usable EPA and DHA. Five years of a heart-healthy diet helped in many ways, but it did not deliver enough of the specific forms her labs show she needs. For Fatima, pre-formed EPA and DHA matter more than simply eating more ALA-rich foods.

One more reason the pattern stuck

Her APOE result adds another layer. One copy of ε4 can make dietary fats harder to transport and clear. It is not the main driver of this story, but it makes the FADS finding more important: she is converting less omega-3 into usable forms while also having a lipid system that may be harder to shift. The lab pattern now has a reason.

Five changes to discuss with her clinician

• Ask about a concentrated EPA and DHA supplement, often 2–4g per day combined when clinically appropriate. Fish oil and algae oil both bypass the conversion step.
• Choose fish higher in pre-formed EPA and DHA, such as sardines, mackerel, and wild salmon. The type of fish matters as much as the number of servings.
• Recheck the omega-3 index in about 3 months. It measures EPA and DHA in red blood cell membranes and can show whether the plan is working.
• Reduce refined carbohydrates. White bread, rice, pastries, and sugary foods can raise triglycerides through carbohydrate metabolism, separate from omega-3 status.
• Ask the cardiologist whether a focused 3-month trial is reasonable before long-term medication. Rechecking triglycerides and omega-3 index together would make the next decision clearer.

What her omega-3 status showed

Five years of the wrong omega-3 form did not move the cardiovascular picture enough. These changes target the form her body can use. Current picture after 5 years "eating right" baseline 78%.

• Switch to EPA/DHA supplement 2-4g/day: Bypasses the FADS conversion step and delivers pre-formed EPA and DHA directly to the cardiovascular system.
• Switch fish sources (sardines, mackerel): Higher-EPA fish replace lower-EPA choices and build more direct EPA intake.
• Reduce refined carbohydrates: Refined carbs are a primary triglyceride driver independent of omega-3 status. Reducing them addresses the other half of her elevated triglyceride picture.
• Recheck omega-3 index to guide dosing: Monitoring EPA and DHA in red blood cell membranes confirms whether the supplement is working and guides dose adjustments.