And again, let me clarify. A low-carb diet is not necessary for many people. If you don't want to be on a low-carb diet for whatever reason, (don't need it or just don't care to do it) that's perfectly fine. I'm not looking to convert all readers or tell you how to live your life. I'm just offering it as an option to consider if you've been unable to control your weight to your satisfaction and you're sick of losing the battle of the bulge.
And yes, consulting a doctor is best before beginning any new diet. I forgot the legal disclaimer.

My apologies on that.
You may have trouble finding a doctor or dietician that is open-minded enough to break from the conventional wisdom but it's worth the effort if you feel you need professional permission.
I took an insurance physical 6 months after going low-carb. My blood pressure was down, triglycerides down, total cholesterol down, and HDL (good cholesterol) was up. Oh yeah, I was also 30+ pounds lighter. I got their best rate based on overall heath, scoring "excellent" based on these measures.

Not trying to brag but since the wisdom of my diet has being called into question I will use the above evidence to refute it.
I would not do a canoe trip on a low-carb diet if you recently went on it. I'd give yourself a minimum of 2 months to allow your body to make the adjustment and make sure you are slowly ramping up your exercise during that time.
And on canoe trips, yes, I do allow myself some carbs. I do it mostly because they are lighter-weight and more heat-tolerant than the foods I normally eat at home. But my first day is done on a low-carb diet and I do minimize carbs as much as possible the rest of the days. Plus, when you trip with others you gotta play by their rules on food to a certain extent. I would not want to restrict the carbs of anyone who has not had a chance to adjust before the trip. On my solo trip a couple years back I was more free to cut the carbs, so I did!