Hi musicalpeanuts and welcome!
That six lbs you gained is more than likely water weight or extra roughage/volume that hasn't digested yet. Unless you eat a TON of food every day or very high calorie/high fat it is not likely you could gain that much body weight in such a short time. It takes 3500 calories above and beyond what you need to maintain to gain an extra lb of true body fat. However, daily fluctuations in weight of 5 to 6 lbs isn't that uncommon depending on the volume/weight of food you ate and other factors.
Did you eat a lot of vegetables before? Do you eat beans now? Sometimes the increased plant fiber in a plant based diet can take a while for the body to get used to. Vegans and vegetarians have different gut flora than omnivores over time. A lot of people complain of gas and discomfort early on, especially if used to eating a more low residue diet before, but over time it gets much better. I rarely if ever have gas now and I consume anywhere from four to seven servings of fruits and vegetables a day, and usually two servings on average of beans each day. I added beans to my diet as a staple gradually over a number of years starting in 2007 as opposed to overnight so the transition wasn't as traumatic for me. I remember though, I tried all strictly raw vegan for several weeks a few years ago and suddenly I was eating ten to fifteen servings of whole fruit/vegetables every day to make up my diet and I was going to the bathroom up to ten times a day. I think a much more gradual approach would have sufficed. Going from one extreme to another in diet is going to be hard on the body and take time to get used to.
If you came from a paleo diet before, maybe you could try gradually easing into eating grains and fruit and focus more on nuts, seeds, nut/seed butters and root vegetables and legumes like turnips, sweet potato, rutabagas etc. Those might be easier on your digestion while you transition. Bread is not the healthiest food or easiest to digest (though making your own is healthier and easier to avoid a lot of processed preservatives etc), but there are a number of whole grains like oats, millet, quinoa, brown or wild rice, Bulgar wheat, barley flakes etc that are much healthier, higher in fiber and better for your digestion.
Also, about the constipation. If you are trying to cut out fat or drastically reduce it too much, this can lead to constipation. Under eating can also. Make sure to include some healthy fat in your diet each day, as both a source of nutrition (think omega 3s and stuff like flaxseeds or chia or walnuts or avocado) and satiety. For me personally, if I go too low on fat intake (less than 10-12%) I don't poop as much, though I have been very regular in the years I have been vegan. Everyone is different, but I definitely find that a serving or two of healthy fat helps move things along. Fruits like bananas can be binding for me but I have heard others say the opposite. Higher fiber fruits like apples, plums etc can also help move things along. And be sure to drink plenty of water or other hydrating liquids each day too!
In the end, only kindness matters. - Jewel
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