Keto without wrecking your lipids: who it suits and who should watch their ApoB

Ketogenic diets — very low carbohydrate, high fat, moderate protein — have strong evidence for short-term weight loss, appetite control and glycaemic improvement in type 2 diabetes. They also produce a highly variable lipid response, and for a subset of people that response is a problem worth taking seriously rather than dismissing.

What keto actually is, numerically

Nutritional ketosis generally requires carbohydrate low enough — often under 20 to 50 g/day — that the body shifts to producing ketones for fuel. In macro terms that typically lands around 50 to 70% of energy from fat, 25 to 35% from protein, and under 10% (often under 5%) from carbohydrate. The metabolic benefits for glucose and insulin are well documented; the fat composition is where the caution lives.

The lipid wildcard

For many people, LDL and ApoB stay stable or even improve on keto, especially alongside weight loss. But a distinct group — often lean, metabolically healthy individuals, described in the 'lean mass hyper-responder' literature (Norwitz et al., 2022) — see LDL and ApoB rise sharply, sometimes dramatically, when fat intake is high and saturated fat dominates it. Since ApoB is the better predictor of cardiovascular risk, a large rise is not something to wave away as 'just keto'.

Keto's metabolic wins are real. So is the ApoB rise some people get — and the only way to know which camp you're in is to test.

How to run it more safely

If you do keto, favour monounsaturated and polyunsaturated fats — olive oil, avocado, nuts, oily fish — over a foundation of butter, cheese and fatty red meat, and re-test ApoB within a few months of starting. If ApoB climbs meaningfully, that is real information: shift the fat sources, or reconsider whether a less extreme low-carb approach gets you the glucose benefit without the lipid cost.

How Misi keeps keto honest

Misi's meal library and filters let you build and browse keto meals, but the differentiator is the guardrails: the Saturated Fat as % of Energy chart shows exactly how much of your keto fat is saturated, the biomarker-to-nutrition engine caps saturated fat per meal if your ApoB or LDL is elevated and re-ranks your swaps accordingly, and the Labs tab bridges your saturated-fat intake to your measured LDL so a rising number is caught early, not at your next annual check-up.

Misi is a coaching and wellness platform, not a medical service. If keto raises your ApoB or LDL, or if you have existing cardiovascular or lipid conditions, work with your doctor.