Hi All,

I have two topics that I need help with.

How much caffeine in 24 hr is safe?

I am going to a do ~24 hr event (its a self-organized event that I am going to do on trails) in a couple of weeks and I have a question about maximum amount of caffeine I should take from gels during that.

I do not need to drink coffee on daily basis. I drink a coffee or two on weekends generally. I stopped drinking it on weekends for last few weeks so that it will be more effective when I use it in the event. I won’t have consumed any caffeine for 7 weeks prior to the event.

For reference,

Gels generally come in 0, 20, 35 or 40 mg caffeine versions.

A 12 oz of coffee have ~150 mg caffeine in it.

I was wondering what is the safe amount of total caffeine to consume in 24 hours. May be equivalent to 4 cups of coffee at max = 600 mg caffeine?

Second question regarding liquid meal replacements few hours before the start.

I am planning to start at evening so that I feel 'fresher' in the dark compare to traditional morning starts.

The downside of doing so is, I wont have empty stomach. I was thinking about eating more liquid food on the day time before starting at evening and need some ideas about it. I am looking for simple carbohydrate with high calories.