Let me start off by saying that I have never and will never have this problem lol. However, if I have a random low calorie day, I just take it for what it is. I don't force myself to eat extra if I'm not hungry. However, if you continuously have this problem, I'd say nuts are a good way to go. Good for you and very calorically dense. Also, make sure you've had all your servings of fruits and veggies. If not, I'd blend them up into a smoothie w/ some protein powder. You can easily make that into 300 cals w/o even trying.
You may not need to do anything. If this only happens occasionally, there is no concern. You may find yourself eating at the upper end of your calorie range tomorrow---and everything averages out.
If this is an on-going problem---you first want to make sure you are getting an accurate calorie range from SP based on your needs; and if one is struggling to eat enough food---he/she may need to work with their doctor for further evaluation.
How low on calories? Is this an everyday thing or just once in a while? I eat a lot of veggies and some fruit with nuts and seeds mainly. I have a difficult time always getting to my calories since the veggies take up lots of room in my stomach. But for me it is not an everyday occurrence. I like BUNNYKICKS suggestion. Take a good look at your tracker and see where you are low on nutrients.
I'd be inclined to look at my nutrition tracker and see what i was most low on (fat, carbs or protein.. i also track calcium and iron) and choose my snack based on trying to fulfil the "shortage" areas. Since I'm typically lowest on protein (and, often, calcium) - I'd probably choose a snack like cheese or yogurt.
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