Cereal and snack firm Kellogg’s venture capital fund Eighteen94 Capital has made an investment in plant-based frozen smoothie maker Bright Greens. The $2 million raised is set to be used to scale up the business. Founded in 2015 by Brian Mitchell, Bright Greens aimed to make it more convenient for consumers to get their fruits and vegetables through smoothies that provide “a quick and delicious way of getting healthy fruits …