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The other day I was interested in whether or not it mattered when you drink water in a day. I tend to try to drink most of my water by 1 o’clock. But then I thought—maybe having 45 ounces of water between breakfast and lunch isn’t really doing what I think it is? So I read an article that had some of the same data you are presenting here about how some beverages are more hydrating. I think I understood that the reason for this is because orange juice and milk calories involved so it makes our bodies more able to absorb the water? which made me think maybe I should just be drinking more water with my breakfast and my lunch? What do you think?

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It is not only because they contain calories (i.e. carbohydrates - as the sucrose referenced in the post) it is also the fact they contain electrolytes. Orange juice, outside of carbs (natural sucrose) contains sodium and potassium (see table) which help the body retain and better utilise the fluid when ingested.

When drinking with meals, the food itself can also absorb part of the fluid. But be careful with consuming too much with your meals, especially plain water as it can technically dilute the gastric juices of the stomach, and theoretically in turn it could slow down digestion slightly. However, this won't really have an impact on the glucose absorbed and hence the glucose spike observed post a meal. Having some water with meals is important and also needed for your body's natural digestive process.

I would say try to have some fluids post lunch too, unless you're having very fluid based meals post 1 pm, say a soup for dinner. If you think about it you're "fasting" from water until the next morning if you're not consuming any liquids post lunch.

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Traumatized and never touching a plstic bottle every again

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Ikr! I try to not overthink it too much as so many things are literally in plastic…

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