There are 249 calories in a 3.5 oz serving of Ground beef Ground Beef, crumbled, cooked, drained, rinsed. Calorie breakdown: 57% fat, 0% carbs, 43% protein.here are 249 calories in a 3.5 oz serving of Ground beef Ground Beef, crumbled, cooked, drained, rinsed. Calorie breakdown: 57% fat, 0% carbs, 43% protein.
Sunlight and Vitamin D Synthesis. Exposure to the sunâs ultraviolet (UV) rays is required for vitamin D3 (cholecalciferol) to be produced. Vitamin D3 is synthesized in the skin once your unprotected skin receives exposure to sunlights UV rays. The sun emits three different types of radiation, UVA, UVB and UVC. The ozone layer is good at blocking all of the UVC radiation and most of the UVB, however, none of the UVA radiation.
Vitamin D is really a hormone. Vitamin D is actually a pro-hormone that is involved in many metabolic processes. Your body makes vitamin D from sunlight on your skin,. You can also take supplements and you can get a small amount from fortified food sources such as milk or orange juice.Supplements come in two formats: vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol).itamin D is actually a pro-hormone that is involved in many metabolic processes. Your body makes vitamin D from sunlight on your skin,. You can also take supplements and you can get a small amount from fortified food sources such as milk or orange juice.