CalorieMate (カロリーメイト) is a brand of energy-supplement foods produced by Otsuka Pharmaceutical Co., in Japan. It was first released in 1983 debuting with the cheese flavored block.
CalorieMate comes in several forms, including Block, Jelly, and Can. CalorieMate Block (カロリーメイト ブロック) resembles a bar-shaped cookie (somewhat like a shortbread), sold in packs of either two or four. CalorieMate Jelly (カロリーメイト ゼリー) is a gelatin sold in a pouch with a spout. CalorieMate Can (カロリーメイト 缶) is a canned drink. The packaging is quite plain, almost generic. ~Wikipedia
Appears in Metal Gear Solid 3 and 4.