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AndyR said..
He is wrong about limiting his fruit intake.
Fruit is broken down to glucose.
You need glucose, the simplest form of carbohydrates, to provide energy to every cell in your body. Because glucose is your body's main energy source, most of your calories need to come from carbohydrates
If he is doing long sustained amounts of exercise why would you want to limit the amount of sugar intake
On the baking soda idea I have read that track athletes like 200/400m/800m get onto this to try eliminate the lactic acid build up while competing.
I'll try find where I read it on the net was some time ago now
There is lots of literature now backing the fact that you don't need copious amounts of carbs/glucose to provide fuel, once adapted you body can get fuel from burning fat.
(I hope so because I have a long range tank

)
I just did a quick google on low carb high fat endurance, this is just one of the links.
www.mensjournal.com/health-fitness/paleos-latest-converts-20130618"Paleo guru Mark Sisson, former Ironman triathlete and author of the bestselling 'The Primal Blueprint,' used to think that it wasn't possible to be a world-class endurance athlete on a paleo diet - that you just couldn't overcome the need for copious amounts of glucose in the form of carbohydrates without crashing and burning.
"The assumption has always been that glucose was the preferred fuel with regard to performance," Sisson says. "I used to joke back in my days of sugar burning that, ideally, you would hang an IV bag off the back of your bike and just drip glucose into your bloodstream the whole way."
But Sisson has changed his mind. He says that one of the problems with the few studies conducted on low-carb performance to date is that they were done on athletes who had not yet fully adapted to burning fat as a primary source of fuel, a process that can take weeks, if not months. These flawed studies made paleo a tough sell. "This is a leap of faith that a lot of athletes are unwilling to take," he says. "Imagine you've been doing things a certain way for five or 10 years. And all of the sudden some guy comes along and says he thinks there's a better way. But there's no guarantee.""