This is patently false. Once your body is fat-adapted fat calories provide at least as good an energy source as carbohydrates. And your body can store a lot more fat than carbs.
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Yes, fats do supply more fuel but you canāt access that energy in a high intensity effort.
Slow and steady efforts if youāre burning fats .
Iāll leave specifics to physiology experts and experience with highly trained athletes.
I know endurance runs like to use fats.
Cyclists donāt tend to do so .
Maybe a beer thing?
Do ultra distance eat keto diets?
I donāt know.
Is it different for a trained athlete and someone using keto to lose wt?
I donāt know.
My friends that tried keto couldnāt keep up on fast group rides.
I was stating what appeared to be my observations and that is definitely not a scientific study.
Ah, but you CAN access that energy during high-intensity efforts! Maybe not at the outset of going keto, but once youāre fat adapted that really isnāt an issue. Iāve done 100+ mile rides and turned in some of my fastest climb and sprint times not only since going keto, but even on fasted (16+ hours of no calories) rides.
If you donāt mind, how long have you been on a keto diet?
Do you stay in ketosis or switch to low carb?
If these are too personal, just pass.
I donāt have any experience with people who were keto for over 6 months.
Iāve never done it but I do recommend it for wt loss.
Iām in the US and people need anything to help them.
@Nigel_Tufnel Iām not currently counting calories or even doing macros. Instead Iām sort of just focussing on protein. So if that protein comes with fat thatās cool but Iām not going out of my way to get fat intake because Iām hoping that my body fat can like supplement that. Itās my understanding that animals kind of keep wanting to eat until they have consumed sufficient protein so yeah I think I might be in a calorie deficit but if Iām hungry Iāll eat or at worst Iāll wait the last hour or two till my fast finishes and then Iāll eat till I feel satiated.
Yeah learned my lesson with the salt thing once - I get headaches if I donāt get enough salt.
I was always more focused on being low carb to not spike insulin because you maybe donāt burn fat if you have high insulin. But have been pretty un phased about whether or not Iām like in ketosis because the former strategy is enough for weight-loss. But maybe if I actually need the fuel to do something more strenuous than desk work it makes sense to focus on ketones. Iāll go dust off that myfitness pal app and have a look at macros and calories to see what Iām actually doing. Iāve heard protein can mess with ketosis but hopefully thats more applicable to folks who take extra protein shakes.
Thanks for the tips and input 
While Iāve done keto before and fallen off the bus after xmas holidays; Iāve only been back on track for about a week now though I was semi low carb the week before where I crack at the end of the day and maybe have a slice of mango or something (it takes a while to unlearn the sweet tooth again). Yeah so I always had a āswitch to low carbā approach that worked well enough for weight loss as long as you donāt let it derail you. Like if you go to a restaurant with friends you can say no to fries but youāre probably going to have more carbs than you want to.
Anyway itās never really bothered me living on the low carb cusp and I figured maybe Iām just someone who can switch easily between fuel sources but the most strenuous thing I was doing was walking the dog and climbing stairs. But yeah I think Iāll start tracking macros for a bit to get a better picture because maybe I need a more consistent fuel source to get into cycling.
Thanks
Hi Guys, This forum is excellent and Iām really hoping you can help me . Iāve been doing Keto for 3 months and feel the fittest Iāve ever felt. Mentally and physically. On the first month I couldnāt complete a 15 mile cycle no Iām fully fat dependant I can do a 70 mile cycle with a 18mph avg on no food or just a handful of nuts. My question is this . Iām going to Mallorca cycling and will cover around 500 miles in 5 days . Am I ok just to start eating carbs again on the coffee stops as Iām worried because of the greater distances I might book. Also is it ok to have a few Beers at the end of the day. Or should I start to ween myself back into carbs before I go.
I think you will be fine, you have only been low carb for 90 days. Enjoy the beers and cake!
I bet you also lost some kgs too right, nice work! Iāve done Keto in the past but 7 months ago I tried counting calories instead after gaining a bunch of weight back because I was not following a strict diet anymore. Iāve dropped over 34 pounds (15 kgs) and have been averaging 140 grams of carbs per day, which is still basically ālow carbā but not low enough to be āketoā.
Oh and also have been hitting power PRās all winter and was just finally upgraded to B on Zwiftpower after being a C cat racer forever.
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Awe Mike thanks for replying.thats exactly how much weight Iāve off from NYE. As I started it as part of the hard 75 and then kept it going. I was just worried that I would have some adverse reaction.
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You may have some GI stress, but who knows? It wouldnt hurt to test it out at home with a carb drink mix during a ride where you can easily access a toilet just in case 
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Ha youāre right Iāll give it a go
just be more mindful of your caloric intake when you start eating carbs again, that was my problem and I gained a bunch of weight back. I cut out a lot of dairy and nuts/seeds to help bring the calories down, I still focus on lean meats, vegetables, and proteins.