If something is zero calories(sucralose) vs 15 calories (sugar), the zero calories will go further toward keeping you fit. I know there are hormonal aspects involved, but calories in vs calories out rules over all else.
I've been suing sucralose in my coffee for years and I'm about 8% body fat. My wife uses it also....she's fit too. So my own empirical findings are that this is a big scare over nothing.
Should you be using 15 packets per day of the stuff? Probably not, but all things in moderation are fine.
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