This is a fictional, illustrative case created for education. It is not medical advice, diagnosis, or treatment, and does not describe a real person.

She followed the low-fat plan. The numbers got worse.

Sofia, 45, cut fat for two years exactly as advised. Her HDL dropped and triglycerides rose. The mystery was not discipline — it was the wrong fuel mix for her body.

Persona

Sofia, 45, Female, Colombian-British, Data analyst.

Two years ago Sofia's total cholesterol was 236 mg/dL and LDL was 151 mg/dL. Her family doctor noted her family history and advised a low-fat, higher-carbohydrate diet. She followed it closely. LDL barely moved, HDL dropped from 62 to 43 mg/dL, and triglycerides climbed from 54 to 100 mg/dL. She feels blamed by numbers she worked hard to improve.

Family history: Father: heart attack at 59, on statins. Paternal aunt: type 2 diabetes. No known Alzheimer's or dementia.

Clinical picture

Symptoms

Labs

Medications

Supplements

Lifestyle

Genetics

She followed the plan, and the pattern got stranger

Sofia is a data analyst, so she treated cholesterol like a problem to solve: follow the plan, track the outputs, adjust if needed. Her family doctor said reduce fat. She reduced fat. She logged meals, switched from olive oil to cooking spray, moved from full-fat yogurt to 0% fat, and cut eggs. At recheck, her protective HDL had dropped, triglycerides had climbed, and LDL barely moved. The plan was supposed to make the picture cleaner. Instead, it made the clues louder.

The pattern was pointing away from fat

HDL falling while triglycerides rise is not random. It can happen when the liver receives more carbohydrate than it can handle cleanly and turns the surplus into fat in the bloodstream. That is not the usual fingerprint of “too much fat.” It points to the fuel swap itself: less fat, more carbohydrate, and a body that did not respond the way the average diet advice expected.

The low-fat rule flipped on her

The standard logic says cutting dietary fat can raise HDL. Sofia's LIPC variant changes that expectation. Her HDL was not being cleared in the usual way, so removing fat may have removed support for the very number her doctor wanted to protect. The drop was not a character flaw. It was a sign that population-average advice did not fit her metabolism. In a woman with APOE ε4, low HDL is a meaningful cardiovascular and cognitive risk clue.

Her liver was making the fat she was trying to avoid

The rising triglycerides were the second clue. Sofia's PPARA variant points to less efficient fuel handling in the liver. When she replaced fat calories with carbohydrates, more surplus glucose could be turned into triglycerides. The blood fat was not simply coming from fat she ate; some of it was being made from the carbohydrates she switched to. Her FADS2 result adds another mismatch: the omega-3 form she takes may not convert well into the EPA and DHA her body needs.

What changes when the target changes

What moves Sofia's picture now

Two years of low-fat dieting moved the clues in the wrong direction. This shows why her next plan focuses on refined carbs, healthy fats, EPA/DHA form, and full lipid context. APOE ε3/ε4 + LIPC + PPARA — after 2 years low-fat diet baseline 78%.

Sofia's 14-day dietary reset check-in

Reduce refined carbs · reintroduce healthy fats · switch omega-3 · no alcohol. Sofia made four changes on day 1: switched from low-fat to Mediterranean-style eating, added olive oil and eggs back in, replaced her fish oil capsule with algae DHA, and cut alcohol for the trial period. The subjective shift — energy, mental clarity, hunger — arrived faster than she expected. The lipid recheck is at 3 months.