While it's not an exact science, many health professionals recommend about 40grams of sugar per day, though the average American takes in 150-200g! In other words, one of the benefits of drinking is improving our immune system.
If you see you've gained, use that as motivation to try harder in the coming days.
One caveat: If you have a family history of breast cancer it is not recommended that you eat extra soy.
All told, you've taken in an extra 500 to 600 calories.
Although there are many other factors that contribute to headache, and dehydration is the most common one.
That's 52 pounds a year! Remember too that, in general, the more color they have, the more antioxidants.
Here's an example: if you're a woman who needs a daily caloric intake of 2000, but you are eating 2500 per day, you are getting a 500 calorie surplus per day.
Keep track of what you are eating and eat everything in moderation.