Or you could just believe the bible and what the Lord says in John 6:28
Then they said to Him, “What shall we do, that we may work the works of God?” 29 Jesus answered and said to them, “This is the work of God, that you believe in Him whom He sent.”
Perhaps you have read other parts of John 6?
47 In all truth I tell you, everyone who believes has eternal life.
48 I am the bread of life.
49 Your fathers ate manna in the desert and they are dead;
50 but this is the bread which comes down from heaven, so that a person may eat it and not die.
51 I am the living bread which has come down from heaven. Anyone who eats this bread will live for ever; and the bread that I shall give is my flesh, for the life of the world.’
52 Then the Jews started arguing among themselves, ‘How can this man give us his flesh to eat?’
53 Jesus replied to them: In all truth I tell you, if you do not eat the flesh of the Son of man and drink his blood, you have no life in you.
54 Anyone who does eat my flesh and drink my blood has eternal life, and I shall raise that person up on the last day.
55 For my flesh is real food and my blood is real drink.
56 Whoever eats my flesh and drinks my blood lives in me and I live in that person.
57 As the living Father sent me and I draw life from the Father, so whoever eats me will also draw life from me.
58 This is the bread which has come down from heaven; it is not like the bread our ancestors ate: they are dead, but anyone who eats this bread will live for ever.