Sodium: content limited to what we believe we need to know about sodium in our daily life, based on our experience and readings.
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What is the purpose of eating an adequate level of sodium?

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All words below in italic are quoted from the book Salt unless otherwise stated.
Man cannot survive without [...] sodium. Before salt became a trading commodity early man got all the sodium he needed through eating fish, shellfish and meat (p26)
>> access the Salt book
What is a reasonable daily intake of sodium?

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2.5 grams of sodium a day (p81) as the recommended intake of a sedentary adult.
Such level needs to be increased when perspiration increases as perspiring translates into a loss of sodium which has to be replaced.
>> access the Salt book
Where is sodium naturally found?

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Typically sodium is ingested when we eat salt. Some foods however do contain sodium in various amounts.
For example, fish and seaweed contain more sodium than other food types. Example: On a tin of tuna chunks in springwater sodium per 100g is listed as: 178mg
In our experience ...

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My current diet is based on fresh food or home-based cooking. So I do not have to consider the salt added to processed foods.
I use a container as a guide with a measure corresponding to a quantity of 6g of iodised rock salt. This would normally be my maximum quantity for the day.

When on our long and slow bike ride, I take extra rock salt which I suck on demand.
How much salt is too much for me? I rely on my body to let me know: whether weakness in the legs when bike riding, or feeling a bit off, my tongue if pale is a good indication that I need salt.

This seems to work for me: I used to dehydrate a lot as a toddler, also as a tennis competitor as a teenager, and up until the beginning of this new diet around 2013. Since then 40+ degrees temperature on a bike ride are no longer a dehydration risk (although not necessarily a pleasant temperature to ride in either :)

Try and find out what works for you given your health condition, activity level, and the type of processed food ie hidden salt/sodium you already eat.