How can I thicken my smoothie without frozen ingredients? I like thick drinks and I cannot lie. 
You other posters can't deny,
That when a shake pours out, all watery and fast
My first thought is "that's just nast(ay)"


Normally, I put in my smoothies a combination of the following:


4-5 med. Strawberries
½ Banana
½(?) cup baby spinach
Rhubarb
Hemp milk
Other seasonal fruits/vegetables
Cocoa powder


I'm also going to experiment with adding things from this list:


Home-made hemp milk (from hemp hearts)
Flax seeds
Small portions of avocado
Tofu


So far, the smoothies have come out with the texture of chocolate milk. I'd like it to be a bit thicker, but I have some very interesting food allergies/intolerance. I'd also like to keep the beverage nearer to room temperature at the time of preparation/consumption.

I cannot consume any of the following items I've found online for thickening:


Xanthan Gum, Guar Gum (other polysaccharides)
Dairy (both cow and goat make me ill, I'm not trying others)
Whey, Pea, or other bean/lentil-based protein powders
Anything considered High-FODMAP


What other methods are there to thicken a smoothie, with neither dairy, nor frozen items?

More FODMAP information:


Examples of low/high fodmap foods
Wikipedia: FODMAP with more reference links
My favorite smoothie thickener is chia seed.

A tablespoon will thicken a blender of smoothie into pudding. According to the internet it is also a low FODMAP food.

It is a small, black seed which will change the texture a bit. With raspberry or strawberry or vanilla they are lost among the other seeds.

It has the added benefit of being neutrally flavored and high in fiber, protein, omega 3 fatty acids, and various minerals.