You are now in a proactive position to make sound choices about your nutrition. Begin to experiment with new and exciting foods, plan meals, be creative. If you have children or a spouse, include them in making changes in your nutrition. We need to take the responsibility by selecting foods that strengthen and energize us and our loved ones. Of course, most of us have spent our entire lives developing our nutritional habits, so don't expect to change them overnight.
Commercial diets are usually one size fits all.
And certainly holidays, seasonal changes, and stressful events all affect how we eat. That's one reason why you need to spend a good amount of time tracking nutrition and experimenting before you find just what works for you. Don't worry if you do overeat at Thanksgiving. It's not an everyday occurrence, and, also, if you don't deprive yourself, you'll be less inclined to overeat generally. It's when that celebration goes on for 365 days a year that you need to reevaluate.