In order to answer the first question, we need to know what “neoliberal globalization” is. This can be defined as globalization of trade under rules that promote free trade. This sort of globalization can trump democracy by forcing countries to open their markets to free trade without regard to what their people want.
In a democracy, the will of the people is supposed to be sovereign. If the majority of the people want a law they should get that law unless it infringes on the fundamental rights of others in the country. In other words, if the people of a country want to have laws that make it harder for companies to import goods, those laws should be passed. The neoliberal global economic system can preclude this. Countries enter into agreements that limit their ability to make such laws. In doing so, they give away their ability to be completely democratic.
This process of globalization can also undermine food sovereignty, particularly in the global south. In the global south, food producers are typically not very efficient. They lack machinery and other things that they would need to have very productive farms. When free trade is imposed, they get outcompeted by the farmers of the global north. This makes it impossible for their countries to retain their food sovereignty.