To get the full benefit of a vegan diet, vegans should do one of the following: Eat fortified foods two or three times a day to get at least three micrograms (mcg or µg) of B12 a day. OR Take one B12 supplement daily providing at least 10 micrograms.

Figure 1 (Woods Hole Research Center, 2009) shows 400,000 years of carbon dioxide concentrations and temperature change taken from ice core data. Upon close examination of this record, it appears that temperature warmed first and was then followed by increases in CO2.

When you take into account meat’s entire lifecycle, each meat eater is responsible for 1.5 more tons of greenhouse gases than a vegan per year, according to a study by the University of Chicago. One of the quickest ways we can lower our collective greenhouse gas emissions is to eat less meat.

To increase the amount of vitamin B12 in your diet, eat more of foods that contain it, such as:

1. Beef, liver, and chicken.
2. Fish and shellfish such as trout, salmon, tuna fish, and clams.
3. Fortified breakfast cereal.
4. Low-fat milk, yogurt, and cheese.
5. Eggs.

Vitamin B12 is only found naturally in foods from animal sources, so sources for vegans are limited and a vitamin B12 supplement may be needed. If you eat dairy products and eggs, you probably get enough. Vegan sources of vitamin B12 include: yeast extract, such as Marmite, which is fortified with vitamin B12.

These include eggs and dairy products, such as milk and cheese. Vegans have a more limited list of options. Fortified foods, or those with added vitamin B12, are a great source. Natural foods such as nutritional yeast, yeast spreads, certain mushrooms, and some algae also contain vitamin B12.

Eggs. Eggs are a great source of complete protein and B vitamins, especially B2 and B12. Two large eggs (100 grams) supply about 46% of the DV for vitamin B12, plus 39% of the DV for vitamin B2 ( 37 ).

Nutrition Information Chicken liver is rich with essential fatty acids and protein. Chicken liver also contains: Vitamin B12.