Weird, because when I started eating LC, my heartburn went away completely. Until then, I was on prescription medication to control the heartburn, but I haven't had to take any of it since starting Atkins. Before Atkins, I've always felt that meats (especially red meats) caused me to have heartburns and constipation, but that obviously wasn't the case for me. When I was on a vacation to Vegas and ate a bunch of sugar and flour for the last 3 days, I had the meanest heartburn that I thought would kill me. I'm also taking Atkins Basic Enzymes which is supposed to be formulated especially for low carb/high fat/high protein diets. Now that I'm back on track, I don't have heartburn at all even though my main staple is meat.