Honestly, the quickest way is to get some nutrient-dense sources. Olive oil, peanut butter, almonds, coconut milk, and even limited amounts of junk food like pizza can go a long way. Fats and protein tend to fill you up, while carbs can tend to increase hunger, so keep that in mind too. Pasta and things like potatoes can go a long way as well.
Trying to get 3000+ calories of "clean food" is a waste of time IMO unless you've just got a huge appetite. You'll just get sick of force feeding yourself. Make sure the protein intake is tight and you've got mostly "healthy" foods in there, then throw in the extras to make totals.
Once you're over maintenance calories with protein needs met, your body doesn't particular care where the excesses come from.
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