http://revach.net/article.php?id=4676

Section: Parshas HaShavua   Category: Chasidus
Parshas VaEschanan: Degel Machenei Ephraim - Attaching The Missing Word
The Seforim HaKedoshim tell us that the we have 248 limbs which draw life from Krias Shema which has 248 words in it.  However, if you count up the words in the three parshiyos of Shema you will find only 247 words.  Where is the 248th word?  The answer is, the word "Emes" that we say after Ani Hashem Elokeichem.

The Degel Machenei Ephraim says we find a Remez for this in the Pasuk (VaEschanan 4:4), "V'Atem HaDveikim B'Hashem Elokeichem Chaim Kulchem HaYom; And you who attach yourself to Hashem are all living today." The word Atem is the same letters as Emes .  If you attach it at the end of Shema to Hashem Elokeichem, then Chaim Kulchem HaYom, all 248 of your limbs will be alive with the Shefa infused by the holy words of Shema.