Targeted keto: carbs when you train, keto the rest of the time. Clever idea, zero trials.
Keto is lousy fuel for hard, fast exercise. Targeted keto tries to fix that with a small carb snack before training. It makes physiological sense. Nobody has properly tested it.
The short version
- What it is
- Standard keto, plus a small portion of fast carbs eaten shortly before a workout.
- Good for
- Active people who want low-carb eating without dying in every interval session.
- Bad at
- Evidence. There are no proper trials of targeted keto itself.
- Evidence
- Weak. Built on related sports-science studies.
- Our take
- A building block for active users: carbs go where the training is.
What targeted keto actually is
Targeted keto (TKD, targeted ketogenic diet) is ordinary keto with one exception: on training days, you eat a small portion of easily digested carbs shortly before your session. A banana, a couple of rice cakes, a bit of white rice. The idea is that your muscles burn those carbs during the workout, so you dip out of ketosis briefly and slip back in afterwards.
It's different from cyclical keto, where you eat high-carb for one or two whole days a week, and from carb cycling, which isn't keto at all. Targeted keto is the smallest possible exception to the rules.
How it works in your body
For walking, lifting at a steady pace or easy cycling, fat is a fine fuel. Keto-adapted people burn a lot of it. In elite race walkers on a very low-carb, high-fat diet, fat burning during exercise shot up to levels rarely seen.1
The problem is speed and intensity. Fat delivers energy more slowly, and per litre of oxygen it gives you less than carbs. In the same study, the low-carb walkers needed more oxygen at race pace, and their race times didn't improve after three weeks of hard training, while the carb-fed groups got 5–7% faster.1 Targeted keto tries to give your muscles the fast fuel just when they need it.
What you eat, what you don't
Eat
- Keto basics: eggs, fish, meat, tofu, olive oil, avocado, nuts, greens
- Before training: a small portion of fast carbs, such as half a banana, rice cakes, a little white rice
- After training: protein, such as eggs, fish, chicken, Greek yoghurt
- Water, plus salt on hard training days
Forget it
- Sports drinks and gels "just in case" on rest days
- Carbs on days with no training
- A big pasta dinner the night before "for training"
- Sugar, soft drinks, sweets
- Bread, pasta, potatoes outside the training snack
A training day on targeted keto
- Morning: eggs with spinach and avocado, black coffee.
- Lunch: chicken or tofu on a big salad with olive oil and seeds.
- 30–60 minutes before an evening session: half a banana or two plain rice cakes.
- After training: salmon or Greek yoghurt-marinated chicken with broccoli and courgette.
Rest days: same, minus the banana. If your session is long and hard, more than about an hour, one small snack beforehand won't cover it. The sports nutrition society suggests around 30–60 g of carbs per hour for sessions like that,9 at which point you're no longer really doing keto, and that's fine.
Targeted keto in Singapore and in Austria, Germany and Switzerland
Singapore: pre-training carbs are easy: a small banana, a couple of slices of plain bread, or a few spoons of plain rice from the economy rice stall. Afterwards, steamed fish, chicken without the rice, or tofu and greens. Traps: isotonic drinks and bubble tea as "recovery".
Austria, Germany, Switzerland: half a banana or a slice of Knäckebrot before training; afterwards, Quark, eggs, smoked trout or chicken with salad. Traps: the post-training Weißbier "for the minerals" and a Brezel that turns into three.
Alcohol on targeted keto
OK, now and then
- Vodka, gin, whisky, tequila: neat, on ice or with soda water and lime
- One glass of dry wine
- Sparkling wine labelled brut nature or extra brut
Out
- Beer as your "recovery drink"
- Cocktails, liqueurs, sweet wine
- Anything with juice, cola, tonic or energy drinks
- Drinking right after a hard session on an empty stomach
50 Club: one light beer with dinner, after you've eaten.
Alcohol pauses fat burning while your liver deals with it: two drinks cut it by about 73% in one study.6 Not great when you're trying to recover. All the details are in our alcohol guide.
What targeted keto is good for, with proof
Keeping high-intensity work possible
The race-walker study shows the problem targeted keto is trying to solve: strict keto made athletes less efficient at speed.1 A sports nutrition framework called "fuel for the work required" argues for exactly this kind of approach: carbs matched to the sessions that need them, less on easy days.3 Note that it's a theory paper. In the studies it reviewed, training with less carbohydrate often boosted training signals in the muscle, but improved actual performance in only about a third.3
Strength training still works on keto
In a 10-week trial of 25 resistance-trained men, strength and power improved about the same on keto as on a normal Western diet. Muscle gain lagged on keto, but caught up once carbs were added back for one week at the end.2 Small study, and two co-authors are well-known keto advocates. But it hints that carbs around training can matter for muscle.
Body composition: diet type matters less than you think
The International Society of Sports Nutrition reviewed the evidence on diets and body composition: fat loss comes down to a sustained calorie deficit, and approaches from low-fat to keto can all work. Protein intake matters more for keeping muscle.4
Protein over timing
The same society's position on nutrient timing puts getting enough protein across the whole day, spread over several meals, ahead of fine-tuning when each gram lands.9
The uncomfortable truth
"Targeted keto gives you keto fat loss and full performance." Nobody knows. We searched for trials that tested targeted keto itself and found none. Everything above is borrowed from related research. It's a sensible guess, not a proven method.
And for fat loss, the keto part isn't magic either. Over a year or more, keto beat low-fat by under a kilo in a meta-analysis of 13 trials.5
Targeted or cyclical keto?
Targeted keto adds a few grams of carbs around training; cyclical keto adds whole days of them. Targeted keeps you closer to ketosis and skips the weekly water swings, and cyclical keto's one trial went badly for muscle and strength (details in that article).
The risks
- Performance. The keto days may still hold back high-intensity work, as the race-walker study showed.1
- Keto's usual risks. LDL cholesterol rose on keto in long-term trials.5 Keto flu in the first week. Constipation with too few vegetables.
- Diabetes drugs. Very low carbs with SGLT2 drugs can cause a serious acid build-up in the blood.7 On insulin, exercise plus low carbs plus a pre-training snack makes dosing tricky. Doctor first.
- Under-fuelling. Training hard on too little food is a real problem for active people, especially young athletes. If your period stops, your performance drops or you keep getting injured, eat more.
Allergies: watch the staples
| Staple | Allergen (EU list of 14)8 | Swap |
|---|---|---|
| Eggs | Eggs | Fish, chicken, tofu |
| Greek yoghurt, whey protein | Milk | Pea or soy protein, soy yoghurt |
| Nuts, nut butter | Tree nuts, peanuts | Pumpkin seeds, sunflower seed butter |
| Salmon, tuna | Fish | Chicken, eggs |
| Rice cakes with sesame | Sesame | Plain rice cakes, banana |
| Oat-based bars | Cereals containing gluten | Banana, rice, certified gluten-free oats |
Don't do targeted keto if you…
- are pregnant or breastfeeding
- have type 1 diabetes, or take insulin or SGLT2 drugs
- have kidney, liver or pancreas disease
- have ever had an eating disorder, or signs of under-fuelling
- are under 18
Healthen me asks about all of these and gives you a different plan if any apply.
How we use targeted keto in your plan
This is a building block for active users. If your Healthen me answers say you train hard several times a week, we move your carbs to where the training is. Your break-fast meal stays keto-style, as for everyone. On training days, a small portion of carbs lands before or after the session. On rest days, meals stay low-carb.
We don't chase ketosis. We chase good training, calm blood sugar and enough protein; see our high-protein article for that bit.
This article is general information, not medical advice. If you have a medical condition or take medication, talk to your doctor before changing how you eat.
Sources
- Burke LM et al. Low carbohydrate, high fat diet impairs exercise economy and negates the performance benefit from intensified training in elite race walkers. Journal of Physiology 2017;595(9):2785–2807. doi.org/10.1113/JP273230
- Wilson JM et al. Effects of ketogenic dieting on body composition, strength, power, and hormonal profiles in resistance training men. Journal of Strength and Conditioning Research 2020;34(12):3463–3474. doi.org/10.1519/JSC.0000000000001935
- Impey SG et al. Fuel for the work required: a theoretical framework for carbohydrate periodization and the glycogen threshold hypothesis. Sports Medicine 2018;48(5):1031–1048. doi.org/10.1007/s40279-018-0867-7
- Aragon AA et al. International society of sports nutrition position stand: diets and body composition. Journal of the International Society of Sports Nutrition 2017;14:16. doi.org/10.1186/s12970-017-0174-y
- Bueno NB et al. Very-low-carbohydrate ketogenic diet v. low-fat diet for long-term weight loss: a meta-analysis of randomised controlled trials. British Journal of Nutrition 2013;110(7):1178–1187. pubmed.ncbi.nlm.nih.gov/23651522
- Siler SQ, Neese RA, Hellerstein MK. De novo lipogenesis, lipid kinetics, and whole-body lipid balances in humans after acute alcohol consumption. American Journal of Clinical Nutrition 1999;70(5):928–936. pubmed.ncbi.nlm.nih.gov/10539756
- US Food and Drug Administration. Drug Safety Communication: FDA warns that SGLT2 inhibitors for diabetes may result in a serious condition of too much acid in the blood, 15 May 2015 (archived copy). web.archive.org: fda.gov/Drugs/DrugSafety/ucm446845.htm Published case series: Mistry S, Cocks Eschler D. Euglycemic diabetic ketoacidosis caused by SGLT2 inhibitors and a ketogenic diet: a case series and review of literature. AACE Clinical Case Reports 2021;7(1):17–19. doi.org/10.1016/j.aace.2020.11.009 (PMC7924151)
- Regulation (EU) No 1169/2011 on food information to consumers, Annex II (the 14 allergens). eur-lex.europa.eu/eli/reg/2011/1169/oj
- Kerksick CM et al. International society of sports nutrition position stand: nutrient timing. Journal of the International Society of Sports Nutrition 2017;14:33. doi.org/10.1186/s12970-017-0189-4